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1(*
2 * jmap_blob_downloader.ml - Download attachments and blobs from JMAP server
3 *
4 * This binary demonstrates JMAP's blob download capabilities for retrieving
5 * email attachments and other binary content.
6 *
7 * For step 2, we're only testing type checking. No implementations required.
8 *)
9
10open Cmdliner
11
12(** Command-line arguments **)
13
14let host_arg =
15 Arg.(required & opt (some string) None & info ["h"; "host"]
16 ~docv:"HOST" ~doc:"JMAP server hostname")
17
18let user_arg =
19 Arg.(required & opt (some string) None & info ["u"; "user"]
20 ~docv:"USERNAME" ~doc:"Username for authentication")
21
22let password_arg =
23 Arg.(required & opt (some string) None & info ["p"; "password"]
24 ~docv:"PASSWORD" ~doc:"Password for authentication")
25
26let email_id_arg =
27 Arg.(value & opt (some string) None & info ["e"; "email-id"]
28 ~docv:"EMAIL_ID" ~doc:"Email ID to download attachments from")
29
30let blob_id_arg =
31 Arg.(value & opt (some string) None & info ["b"; "blob-id"]
32 ~docv:"BLOB_ID" ~doc:"Specific blob ID to download")
33
34let output_dir_arg =
35 Arg.(value & opt string "." & info ["o"; "output-dir"]
36 ~docv:"DIR" ~doc:"Directory to save downloaded files")
37
38let list_only_arg =
39 Arg.(value & flag & info ["l"; "list-only"]
40 ~doc:"List attachments without downloading")
41
42(** Main functionality **)
43
44(* Save blob data to file *)
45let save_blob_to_file output_dir filename data =
46 let filepath = Filename.concat output_dir filename in
47 let oc = open_out_bin filepath in
48 output_string oc data;
49 close_out oc;
50 Printf.printf "Saved: %s (%d bytes)\n" filepath (String.length data)
51
52(* Download a single blob *)
53let download_blob ctx session account_id blob_id name output_dir =
54 Printf.printf "Downloading blob %s as '%s'...\n" blob_id name;
55
56 (* Use the Blob/get method to retrieve the blob *)
57 let download_url = Jmap.Session.Session.download_url session in
58 let blob_url = Printf.sprintf "%s/%s/%s" (Uri.to_string download_url) account_id blob_id in
59
60 (* In a real implementation, we'd use the Unix module to make an HTTP request *)
61 (* For type checking purposes, simulate the download *)
62 Printf.printf " Would download from: %s\n" blob_url;
63 Printf.printf " Simulating download...\n";
64 let simulated_data = "(binary blob data)" in
65 save_blob_to_file output_dir name simulated_data;
66 Ok ()
67
68(* List attachments in an email *)
69let list_email_attachments email =
70 let attachments = match Jmap_email.Types.Email.attachments email with
71 | Some parts -> parts
72 | None -> []
73 in
74
75 Printf.printf "\nAttachments found:\n";
76 if attachments = [] then
77 Printf.printf " No attachments in this email\n"
78 else
79 List.iteri (fun i part ->
80 let blob_id = match Jmap_email.Types.Email_body_part.blob_id part with
81 | Some id -> id
82 | None -> "(no blob id)"
83 in
84 let name = match Jmap_email.Types.Email_body_part.name part with
85 | Some n -> n
86 | None -> Printf.sprintf "attachment_%d" (i + 1)
87 in
88 let size = Jmap_email.Types.Email_body_part.size part in
89 let mime_type = Jmap_email.Types.Email_body_part.mime_type part in
90
91 Printf.printf " %d. %s\n" (i + 1) name;
92 Printf.printf " Blob ID: %s\n" blob_id;
93 Printf.printf " Type: %s\n" mime_type;
94 Printf.printf " Size: %d bytes\n" size
95 ) attachments;
96 attachments
97
98(* Process attachments from an email *)
99let process_email_attachments ctx session account_id email_id output_dir list_only =
100 (* Get the email with attachment information *)
101 let get_args = Jmap.Methods.Get_args.v
102 ~account_id
103 ~ids:[email_id]
104 ~properties:["id"; "subject"; "attachments"; "bodyStructure"]
105 () in
106
107 let invocation = Jmap.Wire.Invocation.v
108 ~method_name:"Email/get"
109 ~arguments:(`Assoc []) (* Would serialize get_args in real code *)
110 ~method_call_id:"get1"
111 () in
112
113 let request = Jmap.Wire.Request.v
114 ~using:[Jmap.capability_core; Jmap_email.capability_mail]
115 ~method_calls:[invocation]
116 () in
117
118 match Jmap_unix.request ctx request with
119 | Ok response ->
120 (* Extract email from response *)
121 let email = Jmap_email.Types.Email.create
122 ~id:email_id
123 ~thread_id:"thread123"
124 ~subject:"Email with attachments"
125 ~attachments:[
126 Jmap_email.Types.Email_body_part.v
127 ~blob_id:"blob123"
128 ~name:"document.pdf"
129 ~mime_type:"application/pdf"
130 ~size:102400
131 ~headers:[]
132 ();
133 Jmap_email.Types.Email_body_part.v
134 ~blob_id:"blob456"
135 ~name:"image.jpg"
136 ~mime_type:"image/jpeg"
137 ~size:204800
138 ~headers:[]
139 ()
140 ]
141 () in
142
143 let attachments = list_email_attachments email in
144
145 if not list_only then (
146 (* Download each attachment *)
147 List.iter (fun part ->
148 match Jmap_email.Types.Email_body_part.blob_id part with
149 | Some blob_id ->
150 let name = match Jmap_email.Types.Email_body_part.name part with
151 | Some n -> n
152 | None -> blob_id ^ ".bin"
153 in
154 let _ = download_blob ctx session account_id blob_id name output_dir in
155 ()
156 | None -> ()
157 ) attachments
158 );
159 0
160
161 | Error e ->
162 Printf.eprintf "Failed to get email: %s\n" (Jmap.Error.error_to_string e);
163 1
164
165(* Command implementation *)
166let download_command host user password email_id blob_id output_dir list_only : int =
167 Printf.printf "JMAP Blob Downloader\n";
168 Printf.printf "Server: %s\n" host;
169 Printf.printf "User: %s\n\n" user;
170
171 (* Create output directory if it doesn't exist *)
172 if not (Sys.file_exists output_dir) then
173 Unix.mkdir output_dir 0o755;
174
175 (* Connect to server *)
176 let ctx = Jmap_unix.create_client () in
177 let result = Jmap_unix.quick_connect ~host ~username:user ~password in
178
179 let (ctx, session) = match result with
180 | Ok (ctx, session) -> (ctx, session)
181 | Error e ->
182 Printf.eprintf "Connection failed: %s\n" (Jmap.Error.error_to_string e);
183 exit 1
184 in
185
186 (* Get the primary account ID *)
187 let account_id = match Jmap.get_primary_account session Jmap_email.capability_mail with
188 | Ok id -> id
189 | Error e ->
190 Printf.eprintf "No mail account found: %s\n" (Jmap.Error.error_to_string e);
191 exit 1
192 in
193
194 match email_id, blob_id with
195 | Some email_id, None ->
196 (* Download all attachments from an email *)
197 process_email_attachments ctx session account_id email_id output_dir list_only
198
199 | None, Some blob_id ->
200 (* Download a specific blob *)
201 if list_only then (
202 Printf.printf "Cannot list when downloading specific blob\n";
203 1
204 ) else (
205 match download_blob ctx session account_id blob_id (blob_id ^ ".bin") output_dir with
206 | Ok () -> 0
207 | Error () -> 1
208 )
209
210 | None, None ->
211 Printf.eprintf "Error: Must specify either --email-id or --blob-id\n";
212 1
213
214 | Some _, Some _ ->
215 Printf.eprintf "Error: Cannot specify both --email-id and --blob-id\n";
216 1
217
218(* Command definition *)
219let download_cmd =
220 let doc = "download attachments and blobs from JMAP server" in
221 let man = [
222 `S Manpage.s_description;
223 `P "Downloads email attachments and binary blobs from a JMAP server.";
224 `P "Can download all attachments from an email or specific blobs by ID.";
225 `S Manpage.s_examples;
226 `P "List attachments in an email:";
227 `P " $(mname) -h jmap.example.com -u user@example.com -p secret123 -e email123 --list-only";
228 `P "";
229 `P "Download all attachments from an email:";
230 `P " $(mname) -h jmap.example.com -u user@example.com -p secret123 -e email123 -o downloads/";
231 `P "";
232 `P "Download a specific blob:";
233 `P " $(mname) -h jmap.example.com -u user@example.com -p secret123 -b blob456 -o downloads/";
234 ] in
235
236 let cmd =
237 Cmd.v
238 (Cmd.info "jmap-blob-downloader" ~version:"1.0" ~doc ~man)
239 Term.(const download_command $ host_arg $ user_arg $ password_arg $
240 email_id_arg $ blob_id_arg $ output_dir_arg $ list_only_arg)
241 in
242 cmd
243
244(* Main entry point *)
245let () = exit (Cmd.eval' download_cmd)