webcit-ng/server/upload.c

   1 // Upload handler
   2 //
   3 // Copyright (c) 1996-2023 by the citadel.org team
   4 //
   5 // This program is open source software.  Use, duplication, or
   6 // disclosure are subject to the GNU General Public License v3.
   7
   8 #include "webcit.h"
   9
  10 Array *upload_list = NULL;                                      // all files uploaded to this webcit instance
  11 pthread_mutex_t upload_list_mutex = PTHREAD_MUTEX_INITIALIZER;  // Lock it before modifying
  12
  13
  14 // This function is called by the MIME parser to handle data uploaded by the browser.
  15 void upload_handler(char *name, char *filename, char *partnum, char *disp,
  16                     void *content, char *cbtype, char *cbcharset,
  17                     size_t length, char *encoding, char *cbid, void *userdata)
  18 {
  19         struct uploaded_file u;
  20
  21         // create a random ID for the attachment
  22         for (int i=0; i<sizeof(u.id); ++i) {
  23                 u.id[i] = (rand() % 26) + 'a';
  24         }
  25         u.id[sizeof(u.id)-1] = 0;
  26
  27         safestrncpy(u.filename, filename, sizeof(u.filename));
  28         safestrncpy(u.content_type, cbtype, sizeof(u.content_type));
  29         u.length = length;
  30
  31         // Write the upload to a file that we can access later when the user saves the message.
  32         // tmpfile() creates a file with zero links in the directory, so it will be deleted when it is closed.
  33         u.fp = tmpfile();
  34         if (!u.fp) {
  35                 syslog(LOG_ERR, "upload: %m");
  36                 return;
  37         }
  38         if (fwrite(content, length, 1, u.fp) != 1) {
  39                 syslog(LOG_ERR, "upload: %m");
  40                 fclose(u.fp);
  41                 return;
  42         }
  43
  44         // Add it to the list of uploads the server is holding.
  45         pthread_mutex_lock(&upload_list_mutex);
  46         if (upload_list == NULL) {
  47                 upload_list = array_new(sizeof(struct uploaded_file));
  48         }
  49         array_append(upload_list, &u);
  50         pthread_mutex_unlock(&upload_list_mutex);
  51
  52         for (int i=0; i<array_len(upload_list); ++i) {
  53                 memcpy(&u, array_get_element_at(upload_list, i), sizeof(struct uploaded_file));
  54         }
  55
  56         // Create a JSON object describing this upload
  57         JsonValue *j_one_upload = NewJsonObject(HKEY(""));
  58         JsonObjectAppend(j_one_upload, NewJsonPlainString(HKEY("ref"), u.id, -1));
  59         JsonObjectAppend(j_one_upload, NewJsonPlainString(HKEY("uploadfilename"), u.filename, -1));
  60         JsonObjectAppend(j_one_upload, NewJsonPlainString(HKEY("contenttype"), u.content_type, -1));
  61         JsonObjectAppend(j_one_upload, NewJsonNumber(HKEY("contentlength"), u.length));
  62
  63         // ...and attach it to the array of uploads
  64         JsonValue *j_uploads = (JsonValue *) userdata;
  65         JsonArrayAppend(j_uploads, j_one_upload);
  66 }
  67
  68 // upload handler
  69 void upload_files(struct http_transaction *h, struct ctdlsession *c) {
  70         // FIXME reject uploads if we're not logged in
  71
  72         // This will be a JSON Array of all files that were uploaded during this HTTP transaction.
  73         // Normally the browser will upload only one file per transaction, but that behavior is not guaranteed.
  74         JsonValue *j_uploads = NewJsonArray(HKEY(""));
  75
  76         // h->request_body_with_synth_headers will contain the upload(s) in MIME format including headers
  77         mime_parser(h->request_body_with_synth_headers, (h->request_body+h->request_body_length), *upload_handler, NULL, NULL, j_uploads, 0);
  78
  79         // probably do something more clever here
  80         h->response_code = 200;
  81         h->response_string = strdup("OK");
  82
  83         // send back a JSON array of all files uploaded
  84         StrBuf *sj = NewStrBuf();
  85         SerializeJson(sj, j_uploads, 1);        // '1' == free the source object
  86         add_response_header(h, strdup("Content-type"), strdup("application/json"));
  87         h->response_code = 200;
  88         h->response_string = strdup("OK");
  89         h->response_body_length = StrLength(sj);
  90         h->response_body = SmashStrBuf(&sj);
  91         syslog(LOG_DEBUG, "upload: %s", h->response_body);
  92 }
  93
  94
  95 // Caller has requested /ctdl/p or /ctdl/p/ but we still have to dispatch based on the method
  96 void ctdl_p_base(struct http_transaction *h, struct ctdlsession *c) {
  97         upload_files(h, c);             // we should only do this for POST requests
  98 }
  99
 100
 101 // delete an uploaded item
 102 void delete_upload(struct uploaded_file this_one) {
 103         int i;
 104         struct uploaded_file *u;
 105
 106         pthread_mutex_lock(&upload_list_mutex);
 107         for (i=0; i<array_len(upload_list); ++i) {
 108                 u = (struct uploaded_file *) array_get_element_at(upload_list, i), sizeof(struct uploaded_file);
 109                 if (!strcmp(u->id, this_one.id)) {
 110                         fclose(u->fp);                          // this deletes the file because it has 0 links
 111                         array_delete_element_at(upload_list, i);
 112                         i = array_len(upload_list) + 1;         // Go out of scope; we're done here
 113                 }
 114         }
 115         pthread_mutex_unlock(&upload_list_mutex);
 116 }
 117
 118
 119 // DAV delete an uploaded item
 120 void dav_delete_upload(struct http_transaction *h, struct ctdlsession *c, struct uploaded_file this_one) {
 121         delete_upload(this_one);
 122         do_204(h);
 123 }
 124
 125
 126 // Remove an uploaded item from the upload_list.  Caller now owns the file handle and is responsible for closing it.
 127 struct uploaded_file pop_upload(char *id) {
 128         int i;
 129         struct uploaded_file *u;
 130         struct uploaded_file ret;
 131
 132         memset(&ret, 0, sizeof(struct uploaded_file));
 133
 134         pthread_mutex_lock(&upload_list_mutex);
 135         for (i=0; i<array_len(upload_list); ++i) {
 136                 u = (struct uploaded_file *) array_get_element_at(upload_list, i), sizeof(struct uploaded_file);
 137                 if (!strcmp(u->id, id)) {
 138                         ret = *u;
 139                         array_delete_element_at(upload_list, i);
 140                         i = array_len(upload_list) + 1;         // Go out of scope; we're done here
 141                 }
 142         }
 143         pthread_mutex_unlock(&upload_list_mutex);
 144
 145         return(ret);                                            // ret will be all-zeroes if we didn't find it
 146 }
 147
 148
 149 // Handle operations on a specific upload
 150 void specific_upload(struct http_transaction *h, struct ctdlsession *c, char *name) {
 151         int i;
 152         struct uploaded_file *u;
 153         struct uploaded_file this_one;
 154
 155         if (upload_list == NULL) {
 156                 do_404(h);
 157                 return;
 158         }
 159
 160         memset(&this_one, 0, sizeof(struct uploaded_file));
 161         pthread_mutex_lock(&upload_list_mutex);
 162         for (i=0; i<array_len(upload_list); ++i) {
 163                 u = (struct uploaded_file *) array_get_element_at(upload_list, i), sizeof(struct uploaded_file);
 164                 if (!strcmp(u->id, name)) {
 165                         memcpy(&this_one, u, sizeof(struct uploaded_file));
 166                         i = array_len(upload_list) + 1;         // Go out of scope; we're done here
 167                 }
 168         }
 169         pthread_mutex_unlock(&upload_list_mutex);
 170
 171         // If we found a matching ID, now dispatch based on the HTTP method.
 172
 173         if (IsEmptyStr(this_one.id)) {                          // didn't find a match
 174                 do_404(h);
 175         }
 176         else if (!strcasecmp(h->method, "GET")) {               // fetch the item
 177                 do_405(h);
 178         }
 179         else if (!strcasecmp(h->method, "DELETE")) {            // delete the item
 180                 dav_delete_upload(h, c, this_one);
 181         }
 182         else {                                                  // unsupported method
 183                 do_405(h);
 184         }
 185 }
 186
 187
 188 // Dispatcher for paths starting with /ctdl/p/
 189 void ctdl_p(struct http_transaction *h, struct ctdlsession *c) {
 190         char buf[SIZ];
 191
 192         if (num_tokens(h->url, '/') == 3) {     //      /ctdl/p
 193                 ctdl_p_base(h, c);
 194                 return;
 195         }
 196
 197         extract_token(buf, h->url, 3, '/', sizeof buf);
 198         if (num_tokens(h->url, '/') == 4) {
 199                 if (IsEmptyStr(buf)) {
 200                         ctdl_p_base(h, c);      //      /ctdl/p/
 201                 }
 202                 else {
 203                         specific_upload(h, c, &h->url[8]);
 204                 }
 205                 return;
 206         }
 207
 208         // If we get to this point, the client requested an action we don't know how to perform.
 209         do_404(h);
 210 }