commit b0dfe64b589c824743de3c3a321998e2dcad56f2 · bretton.dev/coves

+665

internal/atproto/jetstream/comment_consumer.go

···

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       package jetstream

     

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       +
       

     

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       import (

     

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       	"Coves/internal/core/comments"

     

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       	"context"

     

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       	"database/sql"

     

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       	"encoding/json"

     

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       	"fmt"

     

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       	"log"

     

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       	"strings"

     

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       	"time"

     

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       +
       

     

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       	"github.com/lib/pq"

     

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       )

     

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       // Constants for comment validation and processing

     

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       const (

     

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       	// CommentCollection is the lexicon collection identifier for comments

     

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       	CommentCollection = "social.coves.feed.comment"

     

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       	// ATProtoScheme is the URI scheme for atProto AT-URIs

     

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       	ATProtoScheme = "at://"

     

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       	// MaxCommentContentBytes is the maximum allowed size for comment content

     

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       	// Per lexicon: max 3000 graphemes, ~30000 bytes

     

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       	MaxCommentContentBytes = 30000

     

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       )

     

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       // CommentEventConsumer consumes comment-related events from Jetstream

     

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       // Handles CREATE, UPDATE, and DELETE operations for social.coves.feed.comment

     

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       type CommentEventConsumer struct {

     

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       	commentRepo comments.Repository

     

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       	db          *sql.DB // Direct DB access for atomic count updates

     

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       }

     

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       // NewCommentEventConsumer creates a new Jetstream consumer for comment events

     

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       func NewCommentEventConsumer(

     

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       	commentRepo comments.Repository,

     

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       	db *sql.DB,

     

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       ) *CommentEventConsumer {

     

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       	return &CommentEventConsumer{

     

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       		commentRepo: commentRepo,

     

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       		db:          db,

     

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       	}

     

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       }

     

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       // HandleEvent processes a Jetstream event for comment records

     

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       func (c *CommentEventConsumer) HandleEvent(ctx context.Context, event *JetstreamEvent) error {

     

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       	// We only care about commit events for comment records

     

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       	if event.Kind != "commit" || event.Commit == nil {

     

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       		return nil

     

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       	}

     

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       	commit := event.Commit

     

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       	// Handle comment record operations

     

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       	if commit.Collection == CommentCollection {

     

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       		switch commit.Operation {

     

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       		case "create":

     

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       			return c.createComment(ctx, event.Did, commit)

     

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       		case "update":

     

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       			return c.updateComment(ctx, event.Did, commit)

     

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       		case "delete":

     

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       			return c.deleteComment(ctx, event.Did, commit)

     

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       		}

     

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       	}

     

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       	// Silently ignore other operations and collections

     

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       	return nil

     

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       }

     

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       // createComment indexes a new comment from the firehose and updates parent counts

     

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       func (c *CommentEventConsumer) createComment(ctx context.Context, repoDID string, commit *CommitEvent) error {

     

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       	if commit.Record == nil {

     

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       		return fmt.Errorf("comment create event missing record data")

     

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       	}

     

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       	// Parse the comment record

     

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       	commentRecord, err := parseCommentRecord(commit.Record)

     

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       	if err != nil {

     

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       		return fmt.Errorf("failed to parse comment record: %w", err)

     

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       	}

     

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       	// SECURITY: Validate this is a legitimate comment event

     

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       	if err := c.validateCommentEvent(ctx, repoDID, commentRecord); err != nil {

     

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       		log.Printf("🚨 SECURITY: Rejecting comment event: %v", err)

     

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       		return err

     

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       	}

     

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       	// Build AT-URI for this comment

     

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       	// Format: at://commenter_did/social.coves.feed.comment/rkey

     

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       	uri := fmt.Sprintf("at://%s/social.coves.feed.comment/%s", repoDID, commit.RKey)

     

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       	// Parse timestamp from record

     

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       	createdAt, err := time.Parse(time.RFC3339, commentRecord.CreatedAt)

     

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       	if err != nil {

     

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       		log.Printf("Warning: Failed to parse createdAt timestamp, using current time: %v", err)

     

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       		createdAt = time.Now()

     

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       	}

     

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       	// Serialize optional JSON fields

     

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       	facetsJSON, embedJSON, labelsJSON := serializeOptionalFields(commentRecord)

     

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       	// Build comment entity

     

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       	comment := &comments.Comment{

     

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       		URI:           uri,

     

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       		CID:           commit.CID,

     

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       		RKey:          commit.RKey,

     

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       		CommenterDID:  repoDID, // Comment comes from user's repository

     

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       		RootURI:       commentRecord.Reply.Root.URI,

     

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       		RootCID:       commentRecord.Reply.Root.CID,

     

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       		ParentURI:     commentRecord.Reply.Parent.URI,

     

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       		ParentCID:     commentRecord.Reply.Parent.CID,

     

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       		Content:       commentRecord.Content,

     

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       		ContentFacets: facetsJSON,

     

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       		Embed:         embedJSON,

     

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       		ContentLabels: labelsJSON,

     

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       		Langs:         commentRecord.Langs,

     

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       		CreatedAt:     createdAt,

     

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       		IndexedAt:     time.Now(),

     

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       	}

     

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       	// Atomically: Index comment + Update parent counts

     

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       	if err := c.indexCommentAndUpdateCounts(ctx, comment); err != nil {

     

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       		return fmt.Errorf("failed to index comment and update counts: %w", err)

     

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       	}

     

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       	log.Printf("✓ Indexed comment: %s (on %s)", uri, comment.ParentURI)

     

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       	return nil

     

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       }

     

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       // updateComment updates an existing comment's content fields

     

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       func (c *CommentEventConsumer) updateComment(ctx context.Context, repoDID string, commit *CommitEvent) error {

     

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       	if commit.Record == nil {

     

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       		return fmt.Errorf("comment update event missing record data")

     

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       	}

     

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       	// Parse the updated comment record

     

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       	commentRecord, err := parseCommentRecord(commit.Record)

     

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       	if err != nil {

     

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       		return fmt.Errorf("failed to parse comment record: %w", err)

     

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       	}

     

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       	// SECURITY: Validate this is a legitimate update

     

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       	if err := c.validateCommentEvent(ctx, repoDID, commentRecord); err != nil {

     

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       		log.Printf("🚨 SECURITY: Rejecting comment update: %v", err)

     

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       		return err

     

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       	}

     

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       	// Build AT-URI for the comment being updated

     

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       	uri := fmt.Sprintf("at://%s/social.coves.feed.comment/%s", repoDID, commit.RKey)

     

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       	// Fetch existing comment to validate threading references are immutable

     

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       	existingComment, err := c.commentRepo.GetByURI(ctx, uri)

     

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       	if err != nil {

     

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       		if err == comments.ErrCommentNotFound {

     

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       			// Comment doesn't exist yet - might arrive out of order

     

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       			log.Printf("Warning: Update event for non-existent comment: %s (will be indexed on CREATE)", uri)

     

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       			return nil

     

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       		}

     

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       		return fmt.Errorf("failed to get existing comment for validation: %w", err)

     

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       	}

     

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       	// SECURITY: Threading references are IMMUTABLE after creation

     

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       	// Reject updates that attempt to change root/parent (prevents thread hijacking)

     

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       	if existingComment.RootURI != commentRecord.Reply.Root.URI ||

     

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       		existingComment.RootCID != commentRecord.Reply.Root.CID ||

     

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       		existingComment.ParentURI != commentRecord.Reply.Parent.URI ||

     

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       		existingComment.ParentCID != commentRecord.Reply.Parent.CID {

     

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       		log.Printf("🚨 SECURITY: Rejecting comment update - threading references are immutable: %s", uri)

     

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       		log.Printf("  Existing root: %s (CID: %s)", existingComment.RootURI, existingComment.RootCID)

     

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       		log.Printf("  Incoming root: %s (CID: %s)", commentRecord.Reply.Root.URI, commentRecord.Reply.Root.CID)

     

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       		log.Printf("  Existing parent: %s (CID: %s)", existingComment.ParentURI, existingComment.ParentCID)

     

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       		log.Printf("  Incoming parent: %s (CID: %s)", commentRecord.Reply.Parent.URI, commentRecord.Reply.Parent.CID)

     

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       		return fmt.Errorf("comment threading references cannot be changed after creation")

     

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       	}

     

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       	// Serialize optional JSON fields

     

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       	facetsJSON, embedJSON, labelsJSON := serializeOptionalFields(commentRecord)

     

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       	// Build comment update entity (preserves vote counts and created_at)

     

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       	comment := &comments.Comment{

     

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       		URI:           uri,

     

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       		CID:           commit.CID,

     

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       		Content:       commentRecord.Content,

     

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       		ContentFacets: facetsJSON,

     

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       		Embed:         embedJSON,

     

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       		ContentLabels: labelsJSON,

     

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       		Langs:         commentRecord.Langs,

     

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       	}

     

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       	// Update the comment in repository

     

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       	if err := c.commentRepo.Update(ctx, comment); err != nil {

     

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       		return fmt.Errorf("failed to update comment: %w", err)

     

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       	}

     

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       	log.Printf("✓ Updated comment: %s", uri)

     

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       	return nil

     

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       }

     

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       // deleteComment soft-deletes a comment and updates parent counts

     

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       func (c *CommentEventConsumer) deleteComment(ctx context.Context, repoDID string, commit *CommitEvent) error {

     

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       	// Build AT-URI for the comment being deleted

     

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       	uri := fmt.Sprintf("at://%s/social.coves.feed.comment/%s", repoDID, commit.RKey)

     

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       	// Get existing comment to know its parent (for decrementing the right counter)

     

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       	existingComment, err := c.commentRepo.GetByURI(ctx, uri)

     

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       	if err != nil {

     

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       		if err == comments.ErrCommentNotFound {

     

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       			// Idempotent: Comment already deleted or never existed

     

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       			log.Printf("Comment already deleted or not found: %s", uri)

     

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       			return nil

     

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       		}

     

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       		return fmt.Errorf("failed to get existing comment: %w", err)

     

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       	}

     

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       	// Atomically: Soft-delete comment + Update parent counts

     

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       	if err := c.deleteCommentAndUpdateCounts(ctx, existingComment); err != nil {

     

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       		return fmt.Errorf("failed to delete comment and update counts: %w", err)

     

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       	}

     

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       	log.Printf("✓ Deleted comment: %s", uri)

     

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       	return nil

     

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       }

     

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       // indexCommentAndUpdateCounts atomically indexes a comment and updates parent counts

     

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       func (c *CommentEventConsumer) indexCommentAndUpdateCounts(ctx context.Context, comment *comments.Comment) error {

     

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       	tx, err := c.db.BeginTx(ctx, nil)

     

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       	if err != nil {

     

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       		return fmt.Errorf("failed to begin transaction: %w", err)

     

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       	}

     

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       	defer func() {

     

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       		if rollbackErr := tx.Rollback(); rollbackErr != nil && rollbackErr != sql.ErrTxDone {

     

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       			log.Printf("Failed to rollback transaction: %v", rollbackErr)

     

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       		}

     

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       	}()

     

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       	// 1. Check if comment exists and handle resurrection case

     

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       	// In atProto, deleted records' rkeys become available - users can recreate with same rkey

     

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       	// We must distinguish: idempotent replay (skip) vs resurrection (update + restore counts)

     

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       	var existingID int64

     

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       	var existingDeletedAt *time.Time

     

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       	checkQuery := `SELECT id, deleted_at FROM comments WHERE uri = $1`

     

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       	checkErr := tx.QueryRowContext(ctx, checkQuery, comment.URI).Scan(&existingID, &existingDeletedAt)

     

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       	var commentID int64

     

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       	if checkErr == nil {

     

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       		// Comment exists

     

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       		if existingDeletedAt == nil {

     

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       			// Not deleted - this is an idempotent replay, skip gracefully

     

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       			log.Printf("Comment already indexed: %s (idempotent replay)", comment.URI)

     

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       			if commitErr := tx.Commit(); commitErr != nil {

     

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       				return fmt.Errorf("failed to commit transaction: %w", commitErr)

     

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       			}

     

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       			return nil

     

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       +
       		}

     

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       +
       

     

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       		// Comment was soft-deleted, now being recreated (resurrection)

     

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       		// This is a NEW record with same rkey - update ALL fields including threading refs

     

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       		// User may have deleted old comment and created a new one on a different parent/root

     

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       		log.Printf("Resurrecting previously deleted comment: %s", comment.URI)

     

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       		commentID = existingID

     

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       +
       

     

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       		resurrectQuery := `

     

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       			UPDATE comments

     

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       			SET

     

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       				cid = $1,

     

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       				commenter_did = $2,

     

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       				root_uri = $3,

     

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       				root_cid = $4,

     

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       				parent_uri = $5,

     

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       				parent_cid = $6,

     

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       				content = $7,

     

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       				content_facets = $8,

     

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       				embed = $9,

     

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       +
       				content_labels = $10,

     

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       +
       				langs = $11,

     

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       				created_at = $12,

     

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       				indexed_at = $13,

     

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       				deleted_at = NULL,

     

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       				reply_count = 0

     

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       			WHERE id = $14

     

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       		`

     

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       		_, err = tx.ExecContext(

     

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       			ctx, resurrectQuery,

     

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       +
       			comment.CID,

     

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       			comment.CommenterDID,

     

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       			comment.RootURI,

     

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       			comment.RootCID,

     

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       +
       			comment.ParentURI,

     

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       			comment.ParentCID,

     

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       			comment.Content,

     

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       +
       			comment.ContentFacets,

     

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       +
       			comment.Embed,

     

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       +
       			comment.ContentLabels,

     

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       			pq.Array(comment.Langs),

     

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       +
       			comment.CreatedAt,

     

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       			time.Now(),

     

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       			commentID,

     

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       +
       		)

     

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       +
       

     

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       		if err != nil {

     

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       			return fmt.Errorf("failed to resurrect comment: %w", err)

     

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       306
       +
       		}

     

       307
       307
       +
       

     

       308
       308
       +
       	} else if checkErr == sql.ErrNoRows {

     

       309
       309
       +
       		// Comment doesn't exist - insert new comment

     

       310
       310
       +
       		insertQuery := `

     

       311
       311
       +
       			INSERT INTO comments (

     

       312
       312
       +
       				uri, cid, rkey, commenter_did,

     

       313
       313
       +
       				root_uri, root_cid, parent_uri, parent_cid,

     

       314
       314
       +
       				content, content_facets, embed, content_labels, langs,

     

       315
       315
       +
       				created_at, indexed_at

     

       316
       316
       +
       			) VALUES (

     

       317
       317
       +
       				$1, $2, $3, $4,

     

       318
       318
       +
       				$5, $6, $7, $8,

     

       319
       319
       +
       				$9, $10, $11, $12, $13,

     

       320
       320
       +
       				$14, $15

     

       321
       321
       +
       			)

     

       322
       322
       +
       			RETURNING id

     

       323
       323
       +
       		`

     

       324
       324
       +
       

     

       325
       325
       +
       		err = tx.QueryRowContext(

     

       326
       326
       +
       			ctx, insertQuery,

     

       327
       327
       +
       			comment.URI, comment.CID, comment.RKey, comment.CommenterDID,

     

       328
       328
       +
       			comment.RootURI, comment.RootCID, comment.ParentURI, comment.ParentCID,

     

       329
       329
       +
       			comment.Content, comment.ContentFacets, comment.Embed, comment.ContentLabels, pq.Array(comment.Langs),

     

       330
       330
       +
       			comment.CreatedAt, time.Now(),

     

       331
       331
       +
       		).Scan(&commentID)

     

       332
       332
       +
       

     

       333
       333
       +
       		if err != nil {

     

       334
       334
       +
       			return fmt.Errorf("failed to insert comment: %w", err)

     

       335
       335
       +
       		}

     

       336
       336
       +
       

     

       337
       337
       +
       	} else {

     

       338
       338
       +
       		// Unexpected error checking for existing comment

     

       339
       339
       +
       		return fmt.Errorf("failed to check for existing comment: %w", checkErr)

     

       340
       340
       +
       	}

     

       341
       341
       +
       

     

       342
       342
       +
       	// 1.5. Reconcile reply_count for this newly inserted comment

     

       343
       343
       +
       	// In case any replies arrived out-of-order before this parent was indexed

     

       344
       344
       +
       	reconcileQuery := `

     

       345
       345
       +
       		UPDATE comments

     

       346
       346
       +
       		SET reply_count = (

     

       347
       347
       +
       			SELECT COUNT(*)

     

       348
       348
       +
       			FROM comments c

     

       349
       349
       +
       			WHERE c.parent_uri = $1 AND c.deleted_at IS NULL

     

       350
       350
       +
       		)

     

       351
       351
       +
       		WHERE id = $2

     

       352
       352
       +
       	`

     

       353
       353
       +
       	_, reconcileErr := tx.ExecContext(ctx, reconcileQuery, comment.URI, commentID)

     

       354
       354
       +
       	if reconcileErr != nil {

     

       355
       355
       +
       		log.Printf("Warning: Failed to reconcile reply_count for %s: %v", comment.URI, reconcileErr)

     

       356
       356
       +
       		// Continue anyway - this is a best-effort reconciliation

     

       357
       357
       +
       	}

     

       358
       358
       +
       

     

       359
       359
       +
       	// 2. Update parent counts atomically

     

       360
       360
       +
       	// Parent could be a post (increment comment_count) or a comment (increment reply_count)

     

       361
       361
       +
       	// Try posts table first

     

       362
       362
       +
       	//

     

       363
       363
       +
       	// FIXME(P1): Post comment_count reconciliation not implemented

     

       364
       364
       +
       	// When a comment arrives before its parent post (common with cross-repo Jetstream ordering),

     

       365
       365
       +
       	// the post update below returns 0 rows and we only log a warning. Later, when the post

     

       366
       366
       +
       	// is indexed by the post consumer, there's NO reconciliation logic to count pre-existing

     

       367
       367
       +
       	// comments. This causes posts to have permanently stale comment_count values.

     

       368
       368
       +
       	//

     

       369
       369
       +
       	// FIX REQUIRED: Post consumer MUST implement the same reconciliation pattern as comments

     

       370
       370
       +
       	// (see lines 292-305 above). When indexing a new post, count any comments where parent_uri

     

       371
       371
       +
       	// matches the post URI and set comment_count accordingly.

     

       372
       372
       +
       	//

     

       373
       373
       +
       	// Test demonstrating issue: TestCommentConsumer_PostCountReconciliation_Limitation

     

       374
       374
       +
       	updatePostQuery := `

     

       375
       375
       +
       		UPDATE posts

     

       376
       376
       +
       		SET comment_count = comment_count + 1

     

       377
       377
       +
       		WHERE uri = $1 AND deleted_at IS NULL

     

       378
       378
       +
       	`

     

       379
       379
       +
       

     

       380
       380
       +
       	result, err := tx.ExecContext(ctx, updatePostQuery, comment.ParentURI)

     

       381
       381
       +
       	if err != nil {

     

       382
       382
       +
       		return fmt.Errorf("failed to update post comment count: %w", err)

     

       383
       383
       +
       	}

     

       384
       384
       +
       

     

       385
       385
       +
       	rowsAffected, err := result.RowsAffected()

     

       386
       386
       +
       	if err != nil {

     

       387
       387
       +
       		return fmt.Errorf("failed to check update result: %w", err)

     

       388
       388
       +
       	}

     

       389
       389
       +
       

     

       390
       390
       +
       	// If no post was updated, parent is probably a comment

     

       391
       391
       +
       	if rowsAffected == 0 {

     

       392
       392
       +
       		updateCommentQuery := `

     

       393
       393
       +
       			UPDATE comments

     

       394
       394
       +
       			SET reply_count = reply_count + 1

     

       395
       395
       +
       			WHERE uri = $1 AND deleted_at IS NULL

     

       396
       396
       +
       		`

     

       397
       397
       +
       

     

       398
       398
       +
       		result, err := tx.ExecContext(ctx, updateCommentQuery, comment.ParentURI)

     

       399
       399
       +
       		if err != nil {

     

       400
       400
       +
       			return fmt.Errorf("failed to update comment reply count: %w", err)

     

       401
       401
       +
       		}

     

       402
       402
       +
       

     

       403
       403
       +
       		rowsAffected, err := result.RowsAffected()

     

       404
       404
       +
       		if err != nil {

     

       405
       405
       +
       			return fmt.Errorf("failed to check update result: %w", err)

     

       406
       406
       +
       		}

     

       407
       407
       +
       

     

       408
       408
       +
       		// If neither post nor comment was found, that's OK (parent might not be indexed yet)

     

       409
       409
       +
       		if rowsAffected == 0 {

     

       410
       410
       +
       			log.Printf("Warning: Parent not found or deleted: %s (comment indexed anyway)", comment.ParentURI)

     

       411
       411
       +
       		}

     

       412
       412
       +
       	}

     

       413
       413
       +
       

     

       414
       414
       +
       	// Commit transaction

     

       415
       415
       +
       	if err := tx.Commit(); err != nil {

     

       416
       416
       +
       		return fmt.Errorf("failed to commit transaction: %w", err)

     

       417
       417
       +
       	}

     

       418
       418
       +
       

     

       419
       419
       +
       	return nil

     

       420
       420
       +
       }

     

       421
       421
       +
       

     

       422
       422
       +
       // deleteCommentAndUpdateCounts atomically soft-deletes a comment and updates parent counts

     

       423
       423
       +
       func (c *CommentEventConsumer) deleteCommentAndUpdateCounts(ctx context.Context, comment *comments.Comment) error {

     

       424
       424
       +
       	tx, err := c.db.BeginTx(ctx, nil)

     

       425
       425
       +
       	if err != nil {

     

       426
       426
       +
       		return fmt.Errorf("failed to begin transaction: %w", err)

     

       427
       427
       +
       	}

     

       428
       428
       +
       	defer func() {

     

       429
       429
       +
       		if rollbackErr := tx.Rollback(); rollbackErr != nil && rollbackErr != sql.ErrTxDone {

     

       430
       430
       +
       			log.Printf("Failed to rollback transaction: %v", rollbackErr)

     

       431
       431
       +
       		}

     

       432
       432
       +
       	}()

     

       433
       433
       +
       

     

       434
       434
       +
       	// 1. Soft-delete the comment (idempotent)

     

       435
       435
       +
       	deleteQuery := `

     

       436
       436
       +
       		UPDATE comments

     

       437
       437
       +
       		SET deleted_at = $2

     

       438
       438
       +
       		WHERE uri = $1 AND deleted_at IS NULL

     

       439
       439
       +
       	`

     

       440
       440
       +
       

     

       441
       441
       +
       	result, err := tx.ExecContext(ctx, deleteQuery, comment.URI, time.Now())

     

       442
       442
       +
       	if err != nil {

     

       443
       443
       +
       		return fmt.Errorf("failed to delete comment: %w", err)

     

       444
       444
       +
       	}

     

       445
       445
       +
       

     

       446
       446
       +
       	rowsAffected, err := result.RowsAffected()

     

       447
       447
       +
       	if err != nil {

     

       448
       448
       +
       		return fmt.Errorf("failed to check delete result: %w", err)

     

       449
       449
       +
       	}

     

       450
       450
       +
       

     

       451
       451
       +
       	// Idempotent: If no rows affected, comment already deleted

     

       452
       452
       +
       	if rowsAffected == 0 {

     

       453
       453
       +
       		log.Printf("Comment already deleted: %s (idempotent)", comment.URI)

     

       454
       454
       +
       		if commitErr := tx.Commit(); commitErr != nil {

     

       455
       455
       +
       			return fmt.Errorf("failed to commit transaction: %w", commitErr)

     

       456
       456
       +
       		}

     

       457
       457
       +
       		return nil

     

       458
       458
       +
       	}

     

       459
       459
       +
       

     

       460
       460
       +
       	// 2. Decrement parent counts atomically

     

       461
       461
       +
       	// Parent could be a post or comment - try both (use GREATEST to prevent negative)

     

       462
       462
       +
       	updatePostQuery := `

     

       463
       463
       +
       		UPDATE posts

     

       464
       464
       +
       		SET comment_count = GREATEST(0, comment_count - 1)

     

       465
       465
       +
       		WHERE uri = $1 AND deleted_at IS NULL

     

       466
       466
       +
       	`

     

       467
       467
       +
       

     

       468
       468
       +
       	result, err = tx.ExecContext(ctx, updatePostQuery, comment.ParentURI)

     

       469
       469
       +
       	if err != nil {

     

       470
       470
       +
       		return fmt.Errorf("failed to update post comment count: %w", err)

     

       471
       471
       +
       	}

     

       472
       472
       +
       

     

       473
       473
       +
       	rowsAffected, err = result.RowsAffected()

     

       474
       474
       +
       	if err != nil {

     

       475
       475
       +
       		return fmt.Errorf("failed to check update result: %w", err)

     

       476
       476
       +
       	}

     

       477
       477
       +
       

     

       478
       478
       +
       	// If no post was updated, parent is probably a comment

     

       479
       479
       +
       	if rowsAffected == 0 {

     

       480
       480
       +
       		updateCommentQuery := `

     

       481
       481
       +
       			UPDATE comments

     

       482
       482
       +
       			SET reply_count = GREATEST(0, reply_count - 1)

     

       483
       483
       +
       			WHERE uri = $1 AND deleted_at IS NULL

     

       484
       484
       +
       		`

     

       485
       485
       +
       

     

       486
       486
       +
       		result, err := tx.ExecContext(ctx, updateCommentQuery, comment.ParentURI)

     

       487
       487
       +
       		if err != nil {

     

       488
       488
       +
       			return fmt.Errorf("failed to update comment reply count: %w", err)

     

       489
       489
       +
       		}

     

       490
       490
       +
       

     

       491
       491
       +
       		rowsAffected, err := result.RowsAffected()

     

       492
       492
       +
       		if err != nil {

     

       493
       493
       +
       			return fmt.Errorf("failed to check update result: %w", err)

     

       494
       494
       +
       		}

     

       495
       495
       +
       

     

       496
       496
       +
       		// If neither was found, that's OK (parent might be deleted)

     

       497
       497
       +
       		if rowsAffected == 0 {

     

       498
       498
       +
       			log.Printf("Warning: Parent not found or deleted: %s (comment deleted anyway)", comment.ParentURI)

     

       499
       499
       +
       		}

     

       500
       500
       +
       	}

     

       501
       501
       +
       

     

       502
       502
       +
       	// Commit transaction

     

       503
       503
       +
       	if err := tx.Commit(); err != nil {

     

       504
       504
       +
       		return fmt.Errorf("failed to commit transaction: %w", err)

     

       505
       505
       +
       	}

     

       506
       506
       +
       

     

       507
       507
       +
       	return nil

     

       508
       508
       +
       }

     

       509
       509
       +
       

     

       510
       510
       +
       // validateCommentEvent performs security validation on comment events

     

       511
       511
       +
       func (c *CommentEventConsumer) validateCommentEvent(ctx context.Context, repoDID string, comment *CommentRecordFromJetstream) error {

     

       512
       512
       +
       	// SECURITY: Comments MUST come from user repositories (repo owner = commenter DID)

     

       513
       513
       +
       	// The repository owner (repoDID) IS the commenter - comments are stored in user repos.

     

       514
       514
       +
       	//

     

       515
       515
       +
       	// We do NOT check if the user exists in AppView because:

     

       516
       516
       +
       	// 1. Comment events may arrive before user events in Jetstream (race condition)

     

       517
       517
       +
       	// 2. The comment came from the user's PDS repository (authenticated by PDS)

     

       518
       518
       +
       	// 3. The database FK constraint was removed to allow out-of-order indexing

     

       519
       519
       +
       	// 4. Orphaned comments (from never-indexed users) are harmless

     

       520
       520
       +
       	//

     

       521
       521
       +
       	// Security is maintained because:

     

       522
       522
       +
       	// - Comment must come from user's own PDS repository (verified by atProto)

     

       523
       523
       +
       	// - Fake DIDs will fail PDS authentication

     

       524
       524
       +
       

     

       525
       525
       +
       	// Validate DID format (basic sanity check)

     

       526
       526
       +
       	if !strings.HasPrefix(repoDID, "did:") {

     

       527
       527
       +
       		return fmt.Errorf("invalid commenter DID format: %s", repoDID)

     

       528
       528
       +
       	}

     

       529
       529
       +
       

     

       530
       530
       +
       	// Validate content is not empty (required per lexicon)

     

       531
       531
       +
       	if comment.Content == "" {

     

       532
       532
       +
       		return fmt.Errorf("comment content is required")

     

       533
       533
       +
       	}

     

       534
       534
       +
       

     

       535
       535
       +
       	// Validate content length (defensive check - PDS should enforce this)

     

       536
       536
       +
       	// Per lexicon: max 3000 graphemes, ~30000 bytes

     

       537
       537
       +
       	// We check bytes as a simple defensive measure

     

       538
       538
       +
       	if len(comment.Content) > MaxCommentContentBytes {

     

       539
       539
       +
       		return fmt.Errorf("comment content exceeds maximum length (%d bytes): got %d bytes", MaxCommentContentBytes, len(comment.Content))

     

       540
       540
       +
       	}

     

       541
       541
       +
       

     

       542
       542
       +
       	// Validate reply references exist

     

       543
       543
       +
       	if comment.Reply.Root.URI == "" || comment.Reply.Root.CID == "" {

     

       544
       544
       +
       		return fmt.Errorf("invalid root reference: must have both URI and CID")

     

       545
       545
       +
       	}

     

       546
       546
       +
       

     

       547
       547
       +
       	if comment.Reply.Parent.URI == "" || comment.Reply.Parent.CID == "" {

     

       548
       548
       +
       		return fmt.Errorf("invalid parent reference: must have both URI and CID")

     

       549
       549
       +
       	}

     

       550
       550
       +
       

     

       551
       551
       +
       	// Validate AT-URI structure for root and parent

     

       552
       552
       +
       	if err := validateATURI(comment.Reply.Root.URI); err != nil {

     

       553
       553
       +
       		return fmt.Errorf("invalid root URI: %w", err)

     

       554
       554
       +
       	}

     

       555
       555
       +
       

     

       556
       556
       +
       	if err := validateATURI(comment.Reply.Parent.URI); err != nil {

     

       557
       557
       +
       		return fmt.Errorf("invalid parent URI: %w", err)

     

       558
       558
       +
       	}

     

       559
       559
       +
       

     

       560
       560
       +
       	return nil

     

       561
       561
       +
       }

     

       562
       562
       +
       

     

       563
       563
       +
       // validateATURI performs basic structure validation on AT-URIs

     

       564
       564
       +
       // Format: at://did:method:id/collection/rkey

     

       565
       565
       +
       // This is defensive validation - we trust PDS but catch obviously malformed URIs

     

       566
       566
       +
       func validateATURI(uri string) error {

     

       567
       567
       +
       	if !strings.HasPrefix(uri, ATProtoScheme) {

     

       568
       568
       +
       		return fmt.Errorf("must start with %s", ATProtoScheme)

     

       569
       569
       +
       	}

     

       570
       570
       +
       

     

       571
       571
       +
       	// Remove at:// prefix and split by /

     

       572
       572
       +
       	withoutScheme := strings.TrimPrefix(uri, ATProtoScheme)

     

       573
       573
       +
       	parts := strings.Split(withoutScheme, "/")

     

       574
       574
       +
       

     

       575
       575
       +
       	// Must have at least 3 parts: did, collection, rkey

     

       576
       576
       +
       	if len(parts) < 3 {

     

       577
       577
       +
       		return fmt.Errorf("invalid structure (expected at://did/collection/rkey)")

     

       578
       578
       +
       	}

     

       579
       579
       +
       

     

       580
       580
       +
       	// First part should be a DID

     

       581
       581
       +
       	if !strings.HasPrefix(parts[0], "did:") {

     

       582
       582
       +
       		return fmt.Errorf("repository identifier must be a DID")

     

       583
       583
       +
       	}

     

       584
       584
       +
       

     

       585
       585
       +
       	// Collection and rkey should not be empty

     

       586
       586
       +
       	if parts[1] == "" || parts[2] == "" {

     

       587
       587
       +
       		return fmt.Errorf("collection and rkey cannot be empty")

     

       588
       588
       +
       	}

     

       589
       589
       +
       

     

       590
       590
       +
       	return nil

     

       591
       591
       +
       }

     

       592
       592
       +
       

     

       593
       593
       +
       // CommentRecordFromJetstream represents a comment record as received from Jetstream

     

       594
       594
       +
       // Matches social.coves.feed.comment lexicon

     

       595
       595
       +
       type CommentRecordFromJetstream struct {

     

       596
       596
       +
       	Type      string                 `json:"$type"`

     

       597
       597
       +
       	Reply     ReplyRefFromJetstream  `json:"reply"`

     

       598
       598
       +
       	Content   string                 `json:"content"`

     

       599
       599
       +
       	Facets    []interface{}          `json:"facets,omitempty"`

     

       600
       600
       +
       	Embed     map[string]interface{} `json:"embed,omitempty"`

     

       601
       601
       +
       	Langs     []string               `json:"langs,omitempty"`

     

       602
       602
       +
       	Labels    interface{}            `json:"labels,omitempty"`

     

       603
       603
       +
       	CreatedAt string                 `json:"createdAt"`

     

       604
       604
       +
       }

     

       605
       605
       +
       

     

       606
       606
       +
       // ReplyRefFromJetstream represents the threading structure

     

       607
       607
       +
       type ReplyRefFromJetstream struct {

     

       608
       608
       +
       	Root   StrongRefFromJetstream `json:"root"`

     

       609
       609
       +
       	Parent StrongRefFromJetstream `json:"parent"`

     

       610
       610
       +
       }

     

       611
       611
       +
       

     

       612
       612
       +
       // parseCommentRecord parses a comment record from Jetstream event data

     

       613
       613
       +
       func parseCommentRecord(record map[string]interface{}) (*CommentRecordFromJetstream, error) {

     

       614
       614
       +
       	// Marshal to JSON and back for proper type conversion

     

       615
       615
       +
       	recordJSON, err := json.Marshal(record)

     

       616
       616
       +
       	if err != nil {

     

       617
       617
       +
       		return nil, fmt.Errorf("failed to marshal record: %w", err)

     

       618
       618
       +
       	}

     

       619
       619
       +
       

     

       620
       620
       +
       	var comment CommentRecordFromJetstream

     

       621
       621
       +
       	if err := json.Unmarshal(recordJSON, &comment); err != nil {

     

       622
       622
       +
       		return nil, fmt.Errorf("failed to unmarshal comment record: %w", err)

     

       623
       623
       +
       	}

     

       624
       624
       +
       

     

       625
       625
       +
       	// Validate required fields

     

       626
       626
       +
       	if comment.Content == "" {

     

       627
       627
       +
       		return nil, fmt.Errorf("comment record missing content field")

     

       628
       628
       +
       	}

     

       629
       629
       +
       

     

       630
       630
       +
       	if comment.CreatedAt == "" {

     

       631
       631
       +
       		return nil, fmt.Errorf("comment record missing createdAt field")

     

       632
       632
       +
       	}

     

       633
       633
       +
       

     

       634
       634
       +
       	return &comment, nil

     

       635
       635
       +
       }

     

       636
       636
       +
       

     

       637
       637
       +
       // serializeOptionalFields serializes facets, embed, and labels from a comment record to JSON strings

     

       638
       638
       +
       // Returns nil pointers for empty/nil fields (DRY helper to avoid duplication)

     

       639
       639
       +
       func serializeOptionalFields(commentRecord *CommentRecordFromJetstream) (facetsJSON, embedJSON, labelsJSON *string) {

     

       640
       640
       +
       	// Serialize facets if present

     

       641
       641
       +
       	if commentRecord.Facets != nil && len(commentRecord.Facets) > 0 {

     

       642
       642
       +
       		if facetsBytes, err := json.Marshal(commentRecord.Facets); err == nil {

     

       643
       643
       +
       			facetsStr := string(facetsBytes)

     

       644
       644
       +
       			facetsJSON = &facetsStr

     

       645
       645
       +
       		}

     

       646
       646
       +
       	}

     

       647
       647
       +
       

     

       648
       648
       +
       	// Serialize embed if present

     

       649
       649
       +
       	if commentRecord.Embed != nil && len(commentRecord.Embed) > 0 {

     

       650
       650
       +
       		if embedBytes, err := json.Marshal(commentRecord.Embed); err == nil {

     

       651
       651
       +
       			embedStr := string(embedBytes)

     

       652
       652
       +
       			embedJSON = &embedStr

     

       653
       653
       +
       		}

     

       654
       654
       +
       	}

     

       655
       655
       +
       

     

       656
       656
       +
       	// Serialize labels if present

     

       657
       657
       +
       	if commentRecord.Labels != nil {

     

       658
       658
       +
       		if labelsBytes, err := json.Marshal(commentRecord.Labels); err == nil {

     

       659
       659
       +
       			labelsStr := string(labelsBytes)

     

       660
       660
       +
       			labelsJSON = &labelsStr

     

       661
       661
       +
       		}

     

       662
       662
       +
       	}

     

       663
       663
       +
       

     

       664
       664
       +
       	return facetsJSON, embedJSON, labelsJSON

     

       665
       665
       +
       }

+125

internal/atproto/jetstream/comment_jetstream_connector.go

···

       1
       1
       +
       package jetstream

     

       2
       2
       +
       

     

       3
       3
       +
       import (

     

       4
       4
       +
       	"context"

     

       5
       5
       +
       	"encoding/json"

     

       6
       6
       +
       	"fmt"

     

       7
       7
       +
       	"log"

     

       8
       8
       +
       	"sync"

     

       9
       9
       +
       	"time"

     

       10
       10
       +
       

     

       11
       11
       +
       	"github.com/gorilla/websocket"

     

       12
       12
       +
       )

     

       13
       13
       +
       

     

       14
       14
       +
       // CommentJetstreamConnector handles WebSocket connection to Jetstream for comment events

     

       15
       15
       +
       type CommentJetstreamConnector struct {

     

       16
       16
       +
       	consumer *CommentEventConsumer

     

       17
       17
       +
       	wsURL    string

     

       18
       18
       +
       }

     

       19
       19
       +
       

     

       20
       20
       +
       // NewCommentJetstreamConnector creates a new Jetstream WebSocket connector for comment events

     

       21
       21
       +
       func NewCommentJetstreamConnector(consumer *CommentEventConsumer, wsURL string) *CommentJetstreamConnector {

     

       22
       22
       +
       	return &CommentJetstreamConnector{

     

       23
       23
       +
       		consumer: consumer,

     

       24
       24
       +
       		wsURL:    wsURL,

     

       25
       25
       +
       	}

     

       26
       26
       +
       }

     

       27
       27
       +
       

     

       28
       28
       +
       // Start begins consuming events from Jetstream

     

       29
       29
       +
       // Runs indefinitely, reconnecting on errors

     

       30
       30
       +
       func (c *CommentJetstreamConnector) Start(ctx context.Context) error {

     

       31
       31
       +
       	log.Printf("Starting Jetstream comment consumer: %s", c.wsURL)

     

       32
       32
       +
       

     

       33
       33
       +
       	for {

     

       34
       34
       +
       		select {

     

       35
       35
       +
       		case <-ctx.Done():

     

       36
       36
       +
       			log.Println("Jetstream comment consumer shutting down")

     

       37
       37
       +
       			return ctx.Err()

     

       38
       38
       +
       		default:

     

       39
       39
       +
       			if err := c.connect(ctx); err != nil {

     

       40
       40
       +
       				log.Printf("Jetstream comment connection error: %v. Retrying in 5s...", err)

     

       41
       41
       +
       				time.Sleep(5 * time.Second)

     

       42
       42
       +
       				continue

     

       43
       43
       +
       			}

     

       44
       44
       +
       		}

     

       45
       45
       +
       	}

     

       46
       46
       +
       }

     

       47
       47
       +
       

     

       48
       48
       +
       // connect establishes WebSocket connection and processes events

     

       49
       49
       +
       func (c *CommentJetstreamConnector) connect(ctx context.Context) error {

     

       50
       50
       +
       	conn, _, err := websocket.DefaultDialer.DialContext(ctx, c.wsURL, nil)

     

       51
       51
       +
       	if err != nil {

     

       52
       52
       +
       		return fmt.Errorf("failed to connect to Jetstream: %w", err)

     

       53
       53
       +
       	}

     

       54
       54
       +
       	defer func() {

     

       55
       55
       +
       		if closeErr := conn.Close(); closeErr != nil {

     

       56
       56
       +
       			log.Printf("Failed to close WebSocket connection: %v", closeErr)

     

       57
       57
       +
       		}

     

       58
       58
       +
       	}()

     

       59
       59
       +
       

     

       60
       60
       +
       	log.Println("Connected to Jetstream (comment consumer)")

     

       61
       61
       +
       

     

       62
       62
       +
       	// Set read deadline to detect connection issues

     

       63
       63
       +
       	if err := conn.SetReadDeadline(time.Now().Add(60 * time.Second)); err != nil {

     

       64
       64
       +
       		log.Printf("Failed to set read deadline: %v", err)

     

       65
       65
       +
       	}

     

       66
       66
       +
       

     

       67
       67
       +
       	// Set pong handler to keep connection alive

     

       68
       68
       +
       	conn.SetPongHandler(func(string) error {

     

       69
       69
       +
       		if err := conn.SetReadDeadline(time.Now().Add(60 * time.Second)); err != nil {

     

       70
       70
       +
       			log.Printf("Failed to set read deadline in pong handler: %v", err)

     

       71
       71
       +
       		}

     

       72
       72
       +
       		return nil

     

       73
       73
       +
       	})

     

       74
       74
       +
       

     

       75
       75
       +
       	// Start ping ticker

     

       76
       76
       +
       	ticker := time.NewTicker(30 * time.Second)

     

       77
       77
       +
       	defer ticker.Stop()

     

       78
       78
       +
       

     

       79
       79
       +
       	done := make(chan struct{})

     

       80
       80
       +
       	var closeOnce sync.Once // Ensure done channel is only closed once

     

       81
       81
       +
       

     

       82
       82
       +
       	// Ping goroutine

     

       83
       83
       +
       	go func() {

     

       84
       84
       +
       		for {

     

       85
       85
       +
       			select {

     

       86
       86
       +
       			case <-ticker.C:

     

       87
       87
       +
       				if err := conn.WriteControl(websocket.PingMessage, []byte{}, time.Now().Add(10*time.Second)); err != nil {

     

       88
       88
       +
       					log.Printf("Failed to send ping: %v", err)

     

       89
       89
       +
       					closeOnce.Do(func() { close(done) })

     

       90
       90
       +
       					return

     

       91
       91
       +
       				}

     

       92
       92
       +
       			case <-done:

     

       93
       93
       +
       				return

     

       94
       94
       +
       			}

     

       95
       95
       +
       		}

     

       96
       96
       +
       	}()

     

       97
       97
       +
       

     

       98
       98
       +
       	// Read loop

     

       99
       99
       +
       	for {

     

       100
       100
       +
       		select {

     

       101
       101
       +
       		case <-done:

     

       102
       102
       +
       			return fmt.Errorf("connection closed by ping failure")

     

       103
       103
       +
       		default:

     

       104
       104
       +
       		}

     

       105
       105
       +
       

     

       106
       106
       +
       		_, message, err := conn.ReadMessage()

     

       107
       107
       +
       		if err != nil {

     

       108
       108
       +
       			closeOnce.Do(func() { close(done) })

     

       109
       109
       +
       			return fmt.Errorf("read error: %w", err)

     

       110
       110
       +
       		}

     

       111
       111
       +
       

     

       112
       112
       +
       		// Parse Jetstream event

     

       113
       113
       +
       		var event JetstreamEvent

     

       114
       114
       +
       		if err := json.Unmarshal(message, &event); err != nil {

     

       115
       115
       +
       			log.Printf("Failed to parse Jetstream event: %v", err)

     

       116
       116
       +
       			continue

     

       117
       117
       +
       		}

     

       118
       118
       +
       

     

       119
       119
       +
       		// Process event through consumer

     

       120
       120
       +
       		if err := c.consumer.HandleEvent(ctx, &event); err != nil {

     

       121
       121
       +
       			log.Printf("Failed to handle comment event: %v", err)

     

       122
       122
       +
       			// Continue processing other events even if one fails

     

       123
       123
       +
       		}

     

       124
       124
       +
       	}

     

       125
       125
       +
       }