/*
** Copyright (c) 2010 D. Richard Hipp
**
** This program is free software; you can redistribute it and/or
** modify it under the terms of the Simplified BSD License (also
** known as the "2-Clause License" or "FreeBSD License".)
**
** This program is distributed in the hope that it will be useful,
** but without any warranty; without even the implied warranty of
** merchantability or fitness for a particular purpose.
**
** Author contact information:
**   drh@hwaci.com
**   http://www.hwaci.com/drh/
**
*******************************************************************************
**
** This file contains code for dealing with attachments.
*/
#include "config.h"
#include "attach.h"
#include <assert.h>

/*
** WEBPAGE: attachlist
** List attachments.
**
**    tkt=HASH
**    page=WIKIPAGE
**    technote=HASH
**
** At most one of technote=, tkt= or page= may be supplied.
**
** If none are given, all attachments are listed.  If one is given, only
** attachments for the designated technote, ticket or wiki page are shown.
**
** HASH may be just a prefix of the relevant technical note or ticket
** artifact hash, in which case all attachments of all technical notes or
** tickets with the prefix will be listed.
*/
void attachlist_page(void){
  const char *zPage = P("page");
  const char *zTkt = P("tkt");
  const char *zTechNote = P("technote");
  Blob sql;
  Stmt q;

  if( zPage && zTkt ) zTkt = 0;
  login_check_credentials();
  style_set_current_feature("attach");
  blob_zero(&sql);
  blob_append_sql(&sql,
     "SELECT datetime(mtime,toLocal()), src, target, filename,"
     "       comment, user,"
     "       (SELECT uuid FROM blob WHERE rid=attachid), attachid,"
     "       (CASE WHEN 'tkt-'||target IN (SELECT tagname FROM tag)"
     "                  THEN 1"
     "             WHEN 'event-'||target IN (SELECT tagname FROM tag)"
     "                  THEN 2"
     "             ELSE 0 END)"
     "  FROM attachment"
  );
  if( zPage ){
    if( g.perm.RdWiki==0 ){ login_needed(g.anon.RdWiki); return; }
    style_header("Attachments To %h", zPage);
    blob_append_sql(&sql, " WHERE target=%Q", zPage);
  }else if( zTkt ){
    if( g.perm.RdTkt==0 ){ login_needed(g.anon.RdTkt); return; }
    style_header("Attachments To Ticket %S", zTkt);
    blob_append_sql(&sql, " WHERE target GLOB '%q*'", zTkt);
  }else if( zTechNote ){
    if( g.perm.RdWiki==0 ){ login_needed(g.anon.RdWiki); return; }
    style_header("Attachments to Tech Note %S", zTechNote);
    blob_append_sql(&sql, " WHERE target GLOB '%q*'",
                    zTechNote);
  }else{
    if( g.perm.RdTkt==0 && g.perm.RdWiki==0 ){
      login_needed(g.anon.RdTkt || g.anon.RdWiki);
      return;
    }
    style_header("All Attachments");
  }
  blob_append_sql(&sql, " ORDER BY mtime DESC");
  db_prepare(&q, "%s", blob_sql_text(&sql));
  @ <ol>
  while( db_step(&q)==SQLITE_ROW ){
    const char *zDate = db_column_text(&q, 0);
    const char *zSrc = db_column_text(&q, 1);
    const char *zTarget = db_column_text(&q, 2);
    const char *zFilename = db_column_text(&q, 3);
    const char *zComment = db_column_text(&q, 4);
    const char *zUser = db_column_text(&q, 5);
    const char *zUuid = db_column_text(&q, 6);
    int attachid = db_column_int(&q, 7);
    /* type 0 is a wiki page, 1 is a ticket, 2 is a tech note */
    int type = db_column_int(&q, 8);
    const char *zDispUser = zUser && zUser[0] ? zUser : "anonymous";
    int i;
    char *zUrlTail;
    for(i=0; zFilename[i]; i++){
      if( zFilename[i]=='/' && zFilename[i+1]!=0 ){
        zFilename = &zFilename[i+1];
        i = -1;
      }
    }
    if( type==1 ){
      zUrlTail = mprintf("tkt=%s&file=%t", zTarget, zFilename);
    }else if( type==2 ){
      zUrlTail = mprintf("technote=%s&file=%t", zTarget, zFilename);
    }else{
      zUrlTail = mprintf("page=%t&file=%t", zTarget, zFilename);
    }
    @ <li><p>
    @ Attachment %z(href("%R/ainfo/%!S",zUuid))%S(zUuid)</a>
    moderation_pending_www(attachid);
    @ <br /><a href="%R/attachview?%s(zUrlTail)">%h(zFilename)</a>
    @ [<a href="%R/attachdownload/%t(zFilename)?%s(zUrlTail)">download</a>]<br>
    if( zComment ) while( fossil_isspace(zComment[0]) ) zComment++;
    if( zComment && zComment[0] ){
      @ %!W(zComment)<br />
    }
    if( zPage==0 && zTkt==0 && zTechNote==0 ){
      if( zSrc==0 || zSrc[0]==0 ){
        zSrc = "Deleted from";
      }else {
        zSrc = "Added to";
      }
      if( type==1 ){
        @ %s(zSrc) ticket <a href="%R/tktview?name=%s(zTarget)">
        @ %S(zTarget)</a>
      }else if( type==2 ){
        @ %s(zSrc) tech note <a href="%R/technote/%s(zTarget)">
        @ %S(zTarget)</a>
      }else{
        @ %s(zSrc) wiki page <a href="%R/wiki?name=%t(zTarget)">
        @ %h(zTarget)</a>
      }
    }else{
      if( zSrc==0 || zSrc[0]==0 ){
        @ Deleted
      }else {
        @ Added
      }
    }
    @ by %h(zDispUser) on
    hyperlink_to_date(zDate, ".");
    free(zUrlTail);
  }
  db_finalize(&q);
  @ </ol>
  style_finish_page();
  return;
}

/*
** WEBPAGE: attachdownload
** WEBPAGE: attachimage
** WEBPAGE: attachview
**
** Download or display an attachment.
**
** Query parameters:
**
**    tkt=HASH
**    page=WIKIPAGE
**    technote=HASH
**    file=FILENAME
**    attachid=ID
**
*/
void attachview_page(void){
  const char *zPage = P("page");
  const char *zTkt = P("tkt");
  const char *zTechNote = P("technote");
  const char *zFile = P("file");
  const char *zTarget = 0;
  int attachid = atoi(PD("attachid","0"));
  char *zUUID;

  if( zFile==0 ) fossil_redirect_home();
  login_check_credentials();
  style_set_current_feature("attach");
  if( zPage ){
    if( g.perm.RdWiki==0 ){ login_needed(g.anon.RdWiki); return; }
    zTarget = zPage;
  }else if( zTkt ){
    if( g.perm.RdTkt==0 ){ login_needed(g.anon.RdTkt); return; }
    zTarget = zTkt;
  }else if( zTechNote ){
    if( g.perm.RdWiki==0 ){ login_needed(g.anon.RdWiki); return; }
    zTarget = zTechNote;
  }else{
    fossil_redirect_home();
  }
  if( attachid>0 ){
    zUUID = db_text(0,
       "SELECT coalesce(src,'x') FROM attachment"
       " WHERE target=%Q AND attachid=%d",
       zTarget, attachid
    );
  }else{
    zUUID = db_text(0,
       "SELECT coalesce(src,'x') FROM attachment"
       " WHERE target=%Q AND filename=%Q"
       " ORDER BY mtime DESC LIMIT 1",
       zTarget, zFile
    );
  }
  if( zUUID==0 || zUUID[0]==0 ){
    style_header("No Such Attachment");
    @ No such attachment....
    style_finish_page();
    return;
  }else if( zUUID[0]=='x' ){
    style_header("Missing");
    @ Attachment has been deleted
    style_finish_page();
    return;
  }else{
    g.perm.Read = 1;
    cgi_replace_parameter("name",zUUID);
    if( fossil_strcmp(g.zPath,"attachview")==0 ){
      artifact_page();
    }else{
      cgi_replace_parameter("m", mimetype_from_name(zFile));
      rawartifact_page();
    }
  }
}

/*
** Save an attachment control artifact into the repository
*/
static void attach_put(
  Blob *pAttach,     /* Text of the Attachment record */
  int attachRid,     /* RID for the file that is being attached */
  int needMod        /* True if the attachment is subject to moderation */
){
  int rid;
  if( needMod ){
    rid = content_put_ex(pAttach, 0, 0, 0, 1);
    moderation_table_create();
    db_multi_exec(
      "INSERT INTO modreq(objid,attachRid) VALUES(%d,%d);",
      rid, attachRid
    );
  }else{
    rid = content_put(pAttach);
    db_multi_exec("INSERT OR IGNORE INTO unsent VALUES(%d);", rid);
    db_multi_exec("INSERT OR IGNORE INTO unclustered VALUES(%d);", rid);
  }
  manifest_crosslink(rid, pAttach, MC_NONE);
}


/*
** Commit a new attachment into the repository
*/
void attach_commit(
  const char *zName,                   /* The filename of the attachment */
  const char *zTarget,                 /* The artifact hash to attach to */
  const char *aContent,                /* The content of the attachment */
  int         szContent,               /* The length of the attachment */
  int         needModerator,           /* Moderate the attachment? */
  const char *zComment                 /* The comment for the attachment */
){
    Blob content;
    Blob manifest;
    Blob cksum;
    char *zUUID;
    char *zDate;
    int rid;
    int i, n;
    int addCompress = 0;
    Manifest *pManifest;

    db_begin_transaction();
    blob_init(&content, aContent, szContent);
    pManifest = manifest_parse(&content, 0, 0);
    manifest_destroy(pManifest);
    blob_init(&content, aContent, szContent);
    if( pManifest ){
      blob_compress(&content, &content);
      addCompress = 1;
    }
    rid = content_put_ex(&content, 0, 0, 0, needModerator);
    zUUID = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", rid);
    blob_zero(&manifest);
    for(i=n=0; zName[i]; i++){
      if( zName[i]=='/' || zName[i]=='\\' ) n = i+1;
    }
    zName += n;
    if( zName[0]==0 ) zName = "unknown";
    blob_appendf(&manifest, "A %F%s %F %s\n",
                 zName, addCompress ? ".gz" : "", zTarget, zUUID);
    while( fossil_isspace(zComment[0]) ) zComment++;
    n = strlen(zComment);
    while( n>0 && fossil_isspace(zComment[n-1]) ){ n--; }
    if( n>0 ){
      blob_appendf(&manifest, "C %#F\n", n, zComment);
    }
    zDate = date_in_standard_format("now");
    blob_appendf(&manifest, "D %s\n", zDate);
    blob_appendf(&manifest, "U %F\n", login_name());
    md5sum_blob(&manifest, &cksum);
    blob_appendf(&manifest, "Z %b\n", &cksum);
    attach_put(&manifest, rid, needModerator);
    assert( blob_is_reset(&manifest) );
    db_end_transaction(0);
}

/*
** WEBPAGE: attachadd
** Add a new attachment.
**
**    tkt=HASH
**    page=WIKIPAGE
**    technote=HASH
**    from=URL
**
*/
void attachadd_page(void){
  const char *zPage = P("page");
  const char *zTkt = P("tkt");
  const char *zTechNote = P("technote");
  const char *zFrom = P("from");
  const char *aContent = P("f");
  const char *zName = PD("f:filename","unknown");
  const char *zTarget;
  char *zTargetType;
  int szContent = atoi(PD("f:bytes","0"));
  int goodCaptcha = 1;

  if( P("cancel") ) cgi_redirect(zFrom);
  if( (zPage && zTkt)
   || (zPage && zTechNote)
   || (zTkt && zTechNote)
  ){
   fossil_redirect_home();
  }
  if( zPage==0 && zTkt==0 && zTechNote==0) fossil_redirect_home();
  login_check_credentials();
  if( zPage ){
    if( g.perm.ApndWiki==0 || g.perm.Attach==0 ){
      login_needed(g.anon.ApndWiki && g.anon.Attach);
      return;
    }
    if( !db_exists("SELECT 1 FROM tag WHERE tagname='wiki-%q'", zPage) ){
      fossil_redirect_home();
    }
    zTarget = zPage;
    zTargetType = mprintf("Wiki Page <a href=\"%R/wiki?name=%h\">%h</a>",
                           zPage, zPage);
  }else if ( zTechNote ){
    if( g.perm.Write==0 || g.perm.ApndWiki==0 || g.perm.Attach==0 ){
      login_needed(g.anon.Write && g.anon.ApndWiki && g.anon.Attach);
      return;
    }
    if( !db_exists("SELECT 1 FROM tag WHERE tagname='event-%q'", zTechNote) ){
      zTechNote = db_text(0, "SELECT substr(tagname,7) FROM tag"
                             " WHERE tagname GLOB 'event-%q*'", zTechNote);
      if( zTechNote==0) fossil_redirect_home();
    }
    zTarget = zTechNote;
    zTargetType = mprintf("Tech Note <a href=\"%R/technote/%s\">%S</a>",
                           zTechNote, zTechNote);

  }else{
    if( g.perm.ApndTkt==0 || g.perm.Attach==0 ){
      login_needed(g.anon.ApndTkt && g.anon.Attach);
      return;
    }
    if( !db_exists("SELECT 1 FROM tag WHERE tagname='tkt-%q'", zTkt) ){
      zTkt = db_text(0, "SELECT substr(tagname,5) FROM tag"
                        " WHERE tagname GLOB 'tkt-%q*'", zTkt);
      if( zTkt==0 ) fossil_redirect_home();
    }
    zTarget = zTkt;
    zTargetType = mprintf("Ticket <a href=\"%R/tktview/%s\">%S</a>",
                          zTkt, zTkt);
  }
  if( zFrom==0 ) zFrom = mprintf("%R/home");
  if( P("cancel") ){
    cgi_redirect(zFrom);
  }
  if( P("ok") && szContent>0 && (goodCaptcha = captcha_is_correct(0)) ){
    int needModerator = (zTkt!=0 && ticket_need_moderation(0)) ||
                        (zPage!=0 && wiki_need_moderation(0));
    const char *zComment = PD("comment", "");
    attach_commit(zName, zTarget, aContent, szContent, needModerator, zComment);
    cgi_redirect(zFrom);
  }
  style_set_current_feature("attach");
  style_header("Add Attachment");
  if( !goodCaptcha ){
    @ <p class="generalError">Error: Incorrect security code.</p>
  }
  @ <h2>Add Attachment To %s(zTargetType)</h2>
  form_begin("enctype='multipart/form-data'", "%R/attachadd");
  @ <div>
  @ File to Attach:
  @ <input type="file" name="f" size="60" /><br />
  @ Description:<br />
  @ <textarea name="comment" cols="80" rows="5" wrap="virtual"></textarea><br />
  if( zTkt ){
    @ <input type="hidden" name="tkt" value="%h(zTkt)" />
  }else if( zTechNote ){
    @ <input type="hidden" name="technote" value="%h(zTechNote)" />
  }else{
    @ <input type="hidden" name="page" value="%h(zPage)" />
  }
  @ <input type="hidden" name="from" value="%h(zFrom)" />
  @ <input type="submit" name="ok" value="Add Attachment" />
  @ <input type="submit" name="cancel" value="Cancel" />
  @ </div>
  captcha_generate(0);
  @ </form>
  style_finish_page();
  fossil_free(zTargetType);
}

/*
** WEBPAGE: ainfo
** URL: /ainfo?name=ARTIFACTID
**
** Show the details of an attachment artifact.
*/
void ainfo_page(void){
  int rid;                       /* RID for the control artifact */
  int ridSrc;                    /* RID for the attached file */
  char *zDate;                   /* Date attached */
  const char *zUuid;             /* Hash of the control artifact */
  Manifest *pAttach;             /* Parse of the control artifact */
  const char *zTarget;           /* Wiki, ticket or tech note attached to */
  const char *zSrc;              /* Hash of the attached file */
  const char *zName;             /* Name of the attached file */
  const char *zDesc;             /* Description of the attached file */
  const char *zWikiName = 0;     /* Wiki page name when attached to Wiki */
  const char *zTNUuid = 0;       /* Tech Note ID when attached to tech note */
  const char *zTktUuid = 0;      /* Ticket ID when attached to a ticket */
  int modPending;                /* True if awaiting moderation */
  const char *zModAction;        /* Moderation action or NULL */
  int isModerator;               /* TRUE if user is the moderator */
  const char *zMime;             /* MIME Type */
  Blob attach;                   /* Content of the attachment */
  int fShowContent = 0;
  const char *zLn = P("ln");

  login_check_credentials();
  if( !g.perm.RdTkt && !g.perm.RdWiki ){
    login_needed(g.anon.RdTkt || g.anon.RdWiki);
    return;
  }
  rid = name_to_rid_www("name");
  if( rid==0 ){ fossil_redirect_home(); }
  zUuid = db_text("", "SELECT uuid FROM blob WHERE rid=%d", rid);
  pAttach = manifest_get(rid, CFTYPE_ATTACHMENT, 0);
  if( pAttach==0 ) fossil_redirect_home();
  zTarget = pAttach->zAttachTarget;
  zSrc = pAttach->zAttachSrc;
  ridSrc = db_int(0,"SELECT rid FROM blob WHERE uuid='%q'", zSrc);
  zName = pAttach->zAttachName;
  zDesc = pAttach->zComment;
  zMime = mimetype_from_name(zName);
  fShowContent = zMime ? strncmp(zMime,"text/", 5)==0 : 0;
  if( validate16(zTarget, strlen(zTarget))
   && db_exists("SELECT 1 FROM ticket WHERE tkt_uuid='%q'", zTarget)
  ){
    zTktUuid = zTarget;
    if( !g.perm.RdTkt ){ login_needed(g.anon.RdTkt); return; }
    if( g.perm.WrTkt ){
      style_submenu_element("Delete", "%R/ainfo/%s?del", zUuid);
    }
  }else if( db_exists("SELECT 1 FROM tag WHERE tagname='wiki-%q'",zTarget) ){
    zWikiName = zTarget;
    if( !g.perm.RdWiki ){ login_needed(g.anon.RdWiki); return; }
    if( g.perm.WrWiki ){
      style_submenu_element("Delete", "%R/ainfo/%s?del", zUuid);
    }
  }else if( db_exists("SELECT 1 FROM tag WHERE tagname='event-%q'",zTarget) ){
    zTNUuid = zTarget;
    if( !g.perm.RdWiki ){ login_needed(g.anon.RdWiki); return; }
    if( g.perm.Write && g.perm.WrWiki ){
      style_submenu_element("Delete", "%R/ainfo/%s?del", zUuid);
    }
  }
  zDate = db_text(0, "SELECT datetime(%.12f)", pAttach->rDate);

  if( P("confirm")
   && ((zTktUuid && g.perm.WrTkt) ||
       (zWikiName && g.perm.WrWiki) ||
       (zTNUuid && g.perm.Write && g.perm.WrWiki))
  ){
    int i, n, rid;
    char *zDate;
    Blob manifest;
    Blob cksum;
    const char *zFile = zName;

    db_begin_transaction();
    blob_zero(&manifest);
    for(i=n=0; zFile[i]; i++){
      if( zFile[i]=='/' || zFile[i]=='\\' ) n = i;
    }
    zFile += n;
    if( zFile[0]==0 ) zFile = "unknown";
    blob_appendf(&manifest, "A %F %F\n", zFile, zTarget);
    zDate = date_in_standard_format("now");
    blob_appendf(&manifest, "D %s\n", zDate);
    blob_appendf(&manifest, "U %F\n", login_name());
    md5sum_blob(&manifest, &cksum);
    blob_appendf(&manifest, "Z %b\n", &cksum);
    rid = content_put(&manifest);
    manifest_crosslink(rid, &manifest, MC_NONE);
    db_end_transaction(0);
    @ <p>The attachment below has been deleted.</p>
  }

  if( P("del")
   && ((zTktUuid && g.perm.WrTkt) ||
       (zWikiName && g.perm.WrWiki) ||
       (zTNUuid && g.perm.Write && g.perm.WrWiki))
  ){
    form_begin(0, "%R/ainfo/%!S", zUuid);
    @ <p>Confirm you want to delete the attachment shown below.
    @ <input type="submit" name="confirm" value="Confirm">
    @ </form>
  }

  isModerator = g.perm.Admin ||
                (zTktUuid && g.perm.ModTkt) ||
                (zWikiName && g.perm.ModWiki);
  if( isModerator && (zModAction = P("modaction"))!=0 ){
    if( strcmp(zModAction,"delete")==0 ){
      moderation_disapprove(rid);
      if( zTktUuid ){
        cgi_redirectf("%R/tktview/%!S", zTktUuid);
      }else{
        cgi_redirectf("%R/wiki?name=%t", zWikiName);
      }
      return;
    }
    if( strcmp(zModAction,"approve")==0 ){
      moderation_approve('a', rid);
    }
  }
  style_set_current_feature("attach");
  style_header("Attachment Details");
  style_submenu_element("Raw", "%R/artifact/%s", zUuid);
  if(fShowContent){
    style_submenu_element("Line Numbers", "%R/ainfo/%s%s", zUuid,
                          ((zLn&&*zLn) ? "" : "?ln=0"));
  }

  @ <div class="section">Overview</div>
  @ <p><table class="label-value">
  @ <tr><th>Artifact&nbsp;ID:</th>
  @ <td>%z(href("%R/artifact/%!S",zUuid))%s(zUuid)</a>
  if( g.perm.Setup ){
    @ (%d(rid))
  }
  modPending = moderation_pending_www(rid);
  if( zTktUuid ){
    @ <tr><th>Ticket:</th>
    @ <td>%z(href("%R/tktview/%s",zTktUuid))%s(zTktUuid)</a></td></tr>
  }
  if( zTNUuid ){
    @ <tr><th>Tech Note:</th>
    @ <td>%z(href("%R/technote/%s",zTNUuid))%s(zTNUuid)</a></td></tr>
  }
  if( zWikiName ){
    @ <tr><th>Wiki&nbsp;Page:</th>
    @ <td>%z(href("%R/wiki?name=%t",zWikiName))%h(zWikiName)</a></td></tr>
  }
  @ <tr><th>Date:</th><td>
  hyperlink_to_date(zDate, "</td></tr>");
  @ <tr><th>User:</th><td>
  hyperlink_to_user(pAttach->zUser, zDate, "</td></tr>");
  @ <tr><th>Artifact&nbsp;Attached:</th>
  @ <td>%z(href("%R/artifact/%s",zSrc))%s(zSrc)</a>
  if( g.perm.Setup ){
    @ (%d(ridSrc))
  }
  @ <tr><th>Filename:</th><td>%h(zName)</td></tr>
  if( g.perm.Setup ){
    @ <tr><th>MIME-Type:</th><td>%h(zMime)</td></tr>
  }
  @ <tr><th valign="top">Description:</th><td valign="top">%h(zDesc)</td></tr>
  @ </table>

  if( isModerator && modPending ){
    @ <div class="section">Moderation</div>
    @ <blockquote>
    form_begin(0, "%R/ainfo/%s", zUuid);
    @ <label><input type="radio" name="modaction" value="delete">
    @ Delete this change</label><br />
    @ <label><input type="radio" name="modaction" value="approve">
    @ Approve this change</label><br />
    @ <input type="submit" value="Submit">
    @ </form>
    @ </blockquote>
  }

  @ <div class="section">Content Appended</div>
  @ <blockquote>
  blob_zero(&attach);
  if( fShowContent ){
    const char *z;
    content_get(ridSrc, &attach);
    blob_to_utf8_no_bom(&attach, 0);
    z = blob_str(&attach);
    if( zLn ){
      output_text_with_line_numbers(z, blob_size(&attach), zName, zLn, 1);
    }else{
      @ <pre>
      @ %h(z)
      @ </pre>
    }
  }else if( strncmp(zMime, "image/", 6)==0 ){
    int sz = db_int(0, "SELECT size FROM blob WHERE rid=%d", ridSrc);
    @ <i>(file is %d(sz) bytes of image data)</i><br />
    @ <img src="%R/raw/%s(zSrc)?m=%s(zMime)"></img>
    style_submenu_element("Image", "%R/raw/%s?m=%s", zSrc, zMime);
  }else{
    int sz = db_int(0, "SELECT size FROM blob WHERE rid=%d", ridSrc);
    @ <i>(file is %d(sz) bytes of binary data)</i>
  }
  @ </blockquote>
  manifest_destroy(pAttach);
  blob_reset(&attach);
  style_finish_page();
}

/*
** Output HTML to show a list of attachments.
*/
void attachment_list(
  const char *zTarget,   /* Object that things are attached to */
  const char *zHeader    /* Header to display with attachments */
){
  int cnt = 0;
  Stmt q;
  db_prepare(&q,
     "SELECT datetime(mtime,toLocal()), filename, user,"
     "       (SELECT uuid FROM blob WHERE rid=attachid), src"
     "  FROM attachment"
     " WHERE isLatest AND src!='' AND target=%Q"
     " ORDER BY mtime DESC",
     zTarget
  );
  while( db_step(&q)==SQLITE_ROW ){
    const char *zDate = db_column_text(&q, 0);
    const char *zFile = db_column_text(&q, 1);
    const char *zUser = db_column_text(&q, 2);
    const char *zUuid = db_column_text(&q, 3);
    const char *zSrc = db_column_text(&q, 4);
    const char *zDispUser = zUser && zUser[0] ? zUser : "anonymous";
    if( cnt==0 ){
      @ %s(zHeader)
    }
    cnt++;
    @ <li>
    @ %z(href("%R/artifact/%!S",zSrc))%h(zFile)</a>
    @ added by %h(zDispUser) on
    hyperlink_to_date(zDate, ".");
    @ [%z(href("%R/ainfo/%!S",zUuid))details</a>]
    @ </li>
  }
  if( cnt ){
    @ </ul>
  }
  db_finalize(&q);

}

/*
** COMMAND: attachment*
**
** Usage: %fossil attachment add ?PAGENAME? FILENAME ?OPTIONS?
**
** Add an attachment to an existing wiki page or tech note.
** Options:
**
**    -t|--technote DATETIME      Specifies the timestamp of
**                                the technote to which the attachment
**                                is to be made. The attachment will be
**                                to the most recently modified tech note
**                                with the specified timestamp.
**
**    -t|--technote TECHNOTE-ID   Specifies the technote to be
**                                updated by its technote id.
**
** One of PAGENAME, DATETIME or TECHNOTE-ID must be specified.
**
** DATETIME may be "now" or "YYYY-MM-DDTHH:MM:SS.SSS". If in
** year-month-day form, it may be truncated, the "T" may be replaced by
** a space, and it may also name a timezone offset from UTC as "-HH:MM"
** (westward) or "+HH:MM" (eastward). Either no timezone suffix or "Z"
** means UTC.
*/
void attachment_cmd(void){
  int n;
  db_find_and_open_repository(0, 0);
  if( g.argc<3 ){
    goto attachment_cmd_usage;
  }
  n = strlen(g.argv[2]);
  if( n==0 ){
    goto attachment_cmd_usage;
  }

  if( strncmp(g.argv[2],"add",n)==0 ){
    const char *zPageName = 0;    /* Name of the wiki page to attach to */
    const char *zFile;            /* Name of the file to be attached */
    const char *zETime;           /* The name of the technote to attach to */
    Manifest *pWiki = 0;          /* Parsed wiki page content */
    char *zBody = 0;              /* Wiki page content */
    int rid;
    const char *zTarget;          /* Target of the attachment */
    Blob content;                 /* The content of the attachment */
    zETime = find_option("technote","t",1);
    if( !zETime ){
      if( g.argc!=5 ){
        usage("add PAGENAME FILENAME");
      }
      zPageName = g.argv[3];
      rid = db_int(0, "SELECT x.rid FROM tag t, tagxref x"
        " WHERE x.tagid=t.tagid AND t.tagname='wiki-%q'"
        " ORDER BY x.mtime DESC LIMIT 1",
        zPageName
      );
      if( (pWiki = manifest_get(rid, CFTYPE_WIKI, 0))!=0 ){
        zBody = pWiki->zWiki;
      }
      if( zBody==0 ){
        fossil_fatal("wiki page [%s] not found",zPageName);
      }
      zTarget = zPageName;
      zFile = g.argv[4];
    }else{
      if( g.argc!=4 ){
        usage("add FILENAME --technote DATETIME|TECHNOTE-ID");
      }
      rid = wiki_technote_to_rid(zETime);
      if( rid<0 ){
        fossil_fatal("ambiguous tech note id: %s", zETime);
      }
      if( (pWiki = manifest_get(rid, CFTYPE_EVENT, 0))!=0 ){
        zBody = pWiki->zWiki;
      }
      if( zBody==0 ){
        fossil_fatal("technote [%s] not found",zETime);
      }
      zTarget = db_text(0,
        "SELECT substr(tagname,7) FROM tag WHERE tagid=(SELECT tagid FROM event WHERE objid='%d')",
        rid
      );
      zFile = g.argv[3];
    }
    blob_read_from_file(&content, zFile, ExtFILE);
    user_select();
    attach_commit(
      zFile,                   /* The filename of the attachment */
      zTarget,                 /* The artifact hash to attach to */
      blob_buffer(&content),   /* The content of the attachment */
      blob_size(&content),     /* The length of the attachment */
      0,                       /* No need to moderate the attachment */
      ""                       /* Empty attachment comment */
    );
    if( !zETime ){
      fossil_print("Attached %s to wiki page %s.\n", zFile, zPageName);
    }else{
      fossil_print("Attached %s to tech note %s.\n", zFile, zETime);
    }
  }else{
    goto attachment_cmd_usage;
  }
  return;

attachment_cmd_usage:
  usage("add ?PAGENAME? FILENAME [-t|--technote DATETIME ]");
}
