kot.pink
1package pages
2
3import (
4 "crypto/hmac"
5 "crypto/sha256"
6 "encoding/hex"
7 "errors"
8 "fmt"
9 "html"
10 "html/template"
11 "log"
12 "math"
13 "net/url"
14 "path/filepath"
15 "reflect"
16 "strings"
17 "time"
18
19 "github.com/dustin/go-humanize"
20 "github.com/microcosm-cc/bluemonday"
21 "tangled.sh/tangled.sh/core/appview/filetree"
22 "tangled.sh/tangled.sh/core/appview/pages/markup"
23)
24
25func (p *Pages) funcMap() template.FuncMap {
26 return template.FuncMap{
27 "split": func(s string) []string {
28 return strings.Split(s, "\n")
29 },
30 "truncateAt30": func(s string) string {
31 if len(s) <= 30 {
32 return s
33 }
34 return s[:30] + "…"
35 },
36 "splitOn": func(s, sep string) []string {
37 return strings.Split(s, sep)
38 },
39 "int64": func(a int) int64 {
40 return int64(a)
41 },
42 "add": func(a, b int) int {
43 return a + b
44 },
45 "now": func() time.Time {
46 return time.Now()
47 },
48 // the absolute state of go templates
49 "add64": func(a, b int64) int64 {
50 return a + b
51 },
52 "sub": func(a, b int) int {
53 return a - b
54 },
55 "f64": func(a int) float64 {
56 return float64(a)
57 },
58 "addf64": func(a, b float64) float64 {
59 return a + b
60 },
61 "subf64": func(a, b float64) float64 {
62 return a - b
63 },
64 "mulf64": func(a, b float64) float64 {
65 return a * b
66 },
67 "divf64": func(a, b float64) float64 {
68 if b == 0 {
69 return 0
70 }
71 return a / b
72 },
73 "negf64": func(a float64) float64 {
74 return -a
75 },
76 "cond": func(cond interface{}, a, b string) string {
77 if cond == nil {
78 return b
79 }
80
81 if boolean, ok := cond.(bool); boolean && ok {
82 return a
83 }
84
85 return b
86 },
87 "didOrHandle": func(did, handle string) string {
88 if handle != "" {
89 return fmt.Sprintf("@%s", handle)
90 } else {
91 return did
92 }
93 },
94 "assoc": func(values ...string) ([][]string, error) {
95 if len(values)%2 != 0 {
96 return nil, fmt.Errorf("invalid assoc call, must have an even number of arguments")
97 }
98 pairs := make([][]string, 0)
99 for i := 0; i < len(values); i += 2 {
100 pairs = append(pairs, []string{values[i], values[i+1]})
101 }
102 return pairs, nil
103 },
104 "append": func(s []string, values ...string) []string {
105 s = append(s, values...)
106 return s
107 },
108 "timeFmt": humanize.Time,
109 "longTimeFmt": func(t time.Time) string {
110 return t.Format("2006-01-02 * 3:04 PM")
111 },
112 "commaFmt": humanize.Comma,
113 "shortTimeFmt": func(t time.Time) string {
114 return humanize.CustomRelTime(t, time.Now(), "", "", []humanize.RelTimeMagnitude{
115 {time.Second, "now", time.Second},
116 {2 * time.Second, "1s %s", 1},
117 {time.Minute, "%ds %s", time.Second},
118 {2 * time.Minute, "1min %s", 1},
119 {time.Hour, "%dmin %s", time.Minute},
120 {2 * time.Hour, "1hr %s", 1},
121 {humanize.Day, "%dhrs %s", time.Hour},
122 {2 * humanize.Day, "1d %s", 1},
123 {20 * humanize.Day, "%dd %s", humanize.Day},
124 {8 * humanize.Week, "%dw %s", humanize.Week},
125 {humanize.Year, "%dmo %s", humanize.Month},
126 {18 * humanize.Month, "1y %s", 1},
127 {2 * humanize.Year, "2y %s", 1},
128 {humanize.LongTime, "%dy %s", humanize.Year},
129 {math.MaxInt64, "a long while %s", 1},
130 })
131 },
132 "durationFmt": func(duration time.Duration) string {
133 days := int64(duration.Hours() / 24)
134 hours := int64(math.Mod(duration.Hours(), 24))
135 minutes := int64(math.Mod(duration.Minutes(), 60))
136 seconds := int64(math.Mod(duration.Seconds(), 60))
137
138 chunks := []struct {
139 name string
140 amount int64
141 }{
142 {"d", days},
143 {"hr", hours},
144 {"min", minutes},
145 {"s", seconds},
146 }
147
148 parts := []string{}
149
150 for _, chunk := range chunks {
151 if chunk.amount != 0 {
152 parts = append(parts, fmt.Sprintf("%d%s", chunk.amount, chunk.name))
153 }
154 }
155
156 return strings.Join(parts, " ")
157 },
158 "byteFmt": humanize.Bytes,
159 "length": func(slice any) int {
160 v := reflect.ValueOf(slice)
161 if v.Kind() == reflect.Slice || v.Kind() == reflect.Array {
162 return v.Len()
163 }
164 return 0
165 },
166 "splitN": func(s, sep string, n int) []string {
167 return strings.SplitN(s, sep, n)
168 },
169 "escapeHtml": func(s string) template.HTML {
170 if s == "" {
171 return template.HTML("<br>")
172 }
173 return template.HTML(s)
174 },
175 "unescapeHtml": func(s string) string {
176 return html.UnescapeString(s)
177 },
178 "nl2br": func(text string) template.HTML {
179 return template.HTML(strings.Replace(template.HTMLEscapeString(text), "\n", "<br>", -1))
180 },
181 "unwrapText": func(text string) string {
182 paragraphs := strings.Split(text, "\n\n")
183
184 for i, p := range paragraphs {
185 lines := strings.Split(p, "\n")
186 paragraphs[i] = strings.Join(lines, " ")
187 }
188
189 return strings.Join(paragraphs, "\n\n")
190 },
191 "sequence": func(n int) []struct{} {
192 return make([]struct{}, n)
193 },
194 // take atmost N items from this slice
195 "take": func(slice any, n int) any {
196 v := reflect.ValueOf(slice)
197 if v.Kind() != reflect.Slice && v.Kind() != reflect.Array {
198 return nil
199 }
200 if v.Len() == 0 {
201 return nil
202 }
203 return v.Slice(0, min(n, v.Len()-1)).Interface()
204 },
205
206 "markdown": func(text string) template.HTML {
207 rctx := &markup.RenderContext{RendererType: markup.RendererTypeDefault}
208 return template.HTML(bluemonday.UGCPolicy().Sanitize(rctx.RenderMarkdown(text)))
209 },
210 "isNil": func(t any) bool {
211 // returns false for other "zero" values
212 return t == nil
213 },
214 "list": func(args ...any) []any {
215 return args
216 },
217 "dict": func(values ...any) (map[string]any, error) {
218 if len(values)%2 != 0 {
219 return nil, errors.New("invalid dict call")
220 }
221 dict := make(map[string]any, len(values)/2)
222 for i := 0; i < len(values); i += 2 {
223 key, ok := values[i].(string)
224 if !ok {
225 return nil, errors.New("dict keys must be strings")
226 }
227 dict[key] = values[i+1]
228 }
229 return dict, nil
230 },
231 "deref": func(v any) any {
232 val := reflect.ValueOf(v)
233 if val.Kind() == reflect.Ptr && !val.IsNil() {
234 return val.Elem().Interface()
235 }
236 return nil
237 },
238 "i": func(name string, classes ...string) template.HTML {
239 data, err := icon(name, classes)
240 if err != nil {
241 log.Printf("icon %s does not exist", name)
242 data, _ = icon("airplay", classes)
243 }
244 return template.HTML(data)
245 },
246 "cssContentHash": CssContentHash,
247 "fileTree": filetree.FileTree,
248 "pathUnescape": func(s string) string {
249 u, _ := url.PathUnescape(s)
250 return u
251 },
252
253 "tinyAvatar": p.tinyAvatar,
254 }
255}
256
257func (p *Pages) tinyAvatar(handle string) string {
258 handle = strings.TrimPrefix(handle, "@")
259 secret := p.avatar.SharedSecret
260 h := hmac.New(sha256.New, []byte(secret))
261 h.Write([]byte(handle))
262 signature := hex.EncodeToString(h.Sum(nil))
263 return fmt.Sprintf("%s/%s/%s?size=tiny", p.avatar.Host, signature, handle)
264}
265
266func icon(name string, classes []string) (template.HTML, error) {
267 iconPath := filepath.Join("static", "icons", name)
268
269 if filepath.Ext(name) == "" {
270 iconPath += ".svg"
271 }
272
273 data, err := Files.ReadFile(iconPath)
274 if err != nil {
275 return "", fmt.Errorf("icon %s not found: %w", name, err)
276 }
277
278 // Convert SVG data to string
279 svgStr := string(data)
280
281 svgTagEnd := strings.Index(svgStr, ">")
282 if svgTagEnd == -1 {
283 return "", fmt.Errorf("invalid SVG format for icon %s", name)
284 }
285
286 classTag := ` class="` + strings.Join(classes, " ") + `"`
287
288 modifiedSVG := svgStr[:svgTagEnd] + classTag + svgStr[svgTagEnd:]
289 return template.HTML(modifiedSVG), nil
290}