webcit/groupdav_main.c

   1 /*
   2  * $Id$
   3  */
   4 /**
   5  * \defgroup GroupdavMain Entry point for GroupDAV functions
   6  * \ingroup WebcitHttpServerGDav
   7  *
   8  */
   9 /*@{*/
  10 #include "webcit.h"
  11 #include "webserver.h"
  12 #include "groupdav.h"
  13
  14
  15 /**
  16  * \brief Output HTTP headers which are common to all requests.
  17  *
  18  * Please observe that we don't use the usual output_headers()
  19  * and wDumpContent() functions in the GroupDAV subsystem, so we
  20  * do our own header stuff here.
  21  *
  22  */
  23 void groupdav_common_headers(void) {
  24         wprintf(
  25                 "Server: %s / %s\r\n"
  26                 "Connection: close\r\n",
  27                 SERVER, serv_info.serv_software
  28         );
  29 }
  30
  31
  32
  33 /**
  34  * \brief string conversion function
  35  * \param target output string
  36  * \param source string to process
  37  */
  38 void euid_escapize(char *target, char *source) {
  39         int i;
  40         int target_length = 0;
  41
  42         strcpy(target, "");
  43         for (i=0; i<strlen(source); ++i) {
  44                 if (isalnum(source[i])) {
  45                         target[target_length] = source[i];
  46                         target[++target_length] = 0;
  47                 }
  48                 else if (source[i] == ' ') {
  49                         target[target_length] = '_';
  50                         target[++target_length] = 0;
  51                 }
  52                 else if (source[i] == '-') {
  53                         target[target_length] = '-';
  54                         target[++target_length] = 0;
  55                 }
  56                 else {
  57                         sprintf(&target[target_length], "%%%02X", source[i]);
  58                         target_length += 3;
  59                 }
  60         }
  61 }
  62
  63 /**
  64  * \brief string conversion function
  65  * \param target output string
  66  * \param source string to process
  67  */
  68 void euid_unescapize(char *target, char *source) {
  69         int a, b;
  70         char hex[3];
  71         int target_length = 0;
  72
  73         strcpy(target, "");
  74
  75         for (a = 0; a < strlen(source); ++a) {
  76                 if (source[a] == '%') {
  77                         hex[0] = source[a + 1];
  78                         hex[1] = source[a + 2];
  79                         hex[2] = 0;
  80                         b = 0;
  81                         sscanf(hex, "%02x", &b);
  82                         target[target_length] = b;
  83                         target[++target_length] = 0;
  84                         a += 2;
  85                 }
  86                 else if (source[a] == '_') {
  87                         target[target_length] = ' ';
  88                         target[++target_length] = 0;
  89                 }
  90                 else if (source[a] == '-') {
  91                         target[target_length] = '-';
  92                         target[++target_length] = 0;
  93                 }
  94                 else {
  95                         target[target_length] = source[a];
  96                         target[++target_length] = 0;
  97                 }
  98         }
  99 }
 100
 101
 102
 103
 104 /**
 105  * \brief Main entry point for GroupDAV requests
 106  * \param req Request header
 107  * \param dav_content_type the kind of dav elemet to represent??
 108  * \param dav_content_length the length of our response
 109  * \param dav_content the actual content to give back
 110  */
 111 void groupdav_main(struct httprequest *req,
 112                         char *dav_content_type,
 113                         int dav_content_length,
 114                         char *dav_content
 115 ) {
 116         struct httprequest *rptr;
 117         char dav_method[256];
 118         char dav_pathname[256];
 119         char dav_ifmatch[256];
 120         char buf[256];
 121         char *ds;
 122         int i;
 123
 124         strcpy(dav_method, "");
 125         strcpy(dav_pathname, "");
 126         strcpy(dav_ifmatch, "");
 127
 128         for (rptr=req; rptr!=NULL; rptr=rptr->next) {
 129                 /* lprintf(9, "< %s\n", rptr->line); */
 130
 131                 /*
 132                  * We don't appear to need this; it was already done in webcit.c
 133                 if (!strncasecmp(rptr->line, "Host: ", 6)) {
 134                         safestrncpy(WC->http_host, &rptr->line[6],
 135                                 sizeof WC->http_host);
 136                 }
 137                 */
 138
 139                 if (!strncasecmp(rptr->line, "If-Match: ", 10)) {
 140                         safestrncpy(dav_ifmatch, &rptr->line[10],
 141                                 sizeof dav_ifmatch);
 142                 }
 143         }
 144
 145         if (!WC->logged_in) {
 146                 wprintf("HTTP/1.1 401 Unauthorized\r\n");
 147                 groupdav_common_headers();
 148                 wprintf("WWW-Authenticate: Basic realm=\"%s\"\r\n",
 149                         serv_info.serv_humannode);
 150                 wprintf("Content-Length: 0\r\n\r\n");
 151                 return;
 152         }
 153
 154         extract_token(dav_method, req->line, 0, ' ', sizeof dav_method);
 155         extract_token(dav_pathname, req->line, 1, ' ', sizeof dav_pathname);
 156         unescape_input(dav_pathname);
 157
 158         /**
 159          * If the request does not begin with "/groupdav", prepend it.  If
 160          * we happen to introduce a double-slash, that's ok; we'll strip it
 161          * in the next step.
 162          */
 163         if (strncasecmp(dav_pathname, "/groupdav", 9)) {
 164                 snprintf(buf, sizeof buf, "/groupdav/%s", dav_pathname);
 165                 safestrncpy(dav_pathname, buf, sizeof dav_pathname);
 166         }
 167
 168         /** Remove any stray double-slashes in pathname */
 169         while (ds=strstr(dav_pathname, "//"), ds != NULL) {
 170                 strcpy(ds, ds+1);
 171         }
 172
 173         /**
 174          * If there's an If-Match: header, strip out the quotes if present, and
 175          * then if all that's left is an asterisk, make it go away entirely.
 176          */
 177         if (strlen(dav_ifmatch) > 0) {
 178                 striplt(dav_ifmatch);
 179                 if (dav_ifmatch[0] == '\"') {
 180                         strcpy(dav_ifmatch, &dav_ifmatch[1]);
 181                         for (i=0; i<strlen(dav_ifmatch); ++i) {
 182                                 if (dav_ifmatch[i] == '\"') {
 183                                         dav_ifmatch[i] = 0;
 184                                 }
 185                         }
 186                 }
 187                 if (!strcmp(dav_ifmatch, "*")) {
 188                         strcpy(dav_ifmatch, "");
 189                 }
 190         }
 191
 192         /**
 193          * The OPTIONS method is not required by GroupDAV.  This is an
 194          * experiment to determine what might be involved in supporting
 195          * other variants of DAV in the future.
 196          */
 197         if (!strcasecmp(dav_method, "OPTIONS")) {
 198                 groupdav_options(dav_pathname);
 199                 return;
 200         }
 201
 202         /**
 203          * The PROPFIND method is basically used to list all objects in a
 204          * room, or to list all relevant rooms on the server.
 205          */
 206         if (!strcasecmp(dav_method, "PROPFIND")) {
 207                 groupdav_propfind(dav_pathname);
 208                 return;
 209         }
 210
 211         /**
 212          * The GET method is used for fetching individual items.
 213          */
 214         if (!strcasecmp(dav_method, "GET")) {
 215                 groupdav_get(dav_pathname);
 216                 return;
 217         }
 218
 219         /**
 220          * The PUT method is used to add or modify items.
 221          */
 222         if (!strcasecmp(dav_method, "PUT")) {
 223                 groupdav_put(dav_pathname, dav_ifmatch,
 224                                 dav_content_type, dav_content);
 225                 return;
 226         }
 227
 228         /**
 229          * The DELETE method kills, maims, and destroys.
 230          */
 231         if (!strcasecmp(dav_method, "DELETE")) {
 232                 groupdav_delete(dav_pathname, dav_ifmatch);
 233                 return;
 234         }
 235
 236         /**
 237          * Couldn't find what we were looking for.  Die in a car fire.
 238          */
 239         wprintf("HTTP/1.1 501 Method not implemented\r\n");
 240         groupdav_common_headers();
 241         wprintf("Content-Type: text/plain\r\n"
 242                 "\r\n"
 243                 "GroupDAV method \"%s\" is not implemented.\r\n",
 244                 dav_method
 245         );
 246 }
 247
 248
 249 /*@}*/