Separate file for attachment edit functions. Functions to move attached files.

[shellwiki] / handlers / 20_edit_attachment.sh

diff --git a/handlers/20_edit_attachment.sh b/handlers/20_edit_attachment.sh
new file mode 100755 (executable)
index 0000000..f400523
--- /dev/null
+++ b/handlers/20_edit_attachment.sh
@@ -0,0 +1,126 @@
+#!/bin/sh
+
+REV_ATTACHMENTS="${REV_ATTACHMENTS:-false}"
+
+if [ "${PATH_INFO##*/\[attachment\]}" ]; then
+  # Skip any action not happening on attachment page
+  return 1
+fi
+
+page="${PATH_INFO%\[attachment\]}"
+action="$(POST action)"
+
+tsid="$(POST session_key)"; tsid="${tsid%% *}"
+
+
+if ! acl_write "${PATH_INFO%\[attachment\]}"; then
+  # Deny access to write protected pages
+  printf 'Refresh: %i\r\n' 4
+  theme_error 403
+  [ "${CONTENT_TYPE%%;*}" = "multipart/form-data" ] \
+  && head -c $((CONTENT_LENGTH)) >/dev/null
+  return 0
+
+elif [ "${CONTENT_TYPE%%;*}" = "multipart/form-data" ]; then
+  . "$_EXEC/multipart.sh"
+  multipart_cache
+
+  # Use positional parameters for filename collection
+  # The positional array is the only array available
+  # in plain posix shells, see the documentation for
+  # your shells "set" builtin for a hint to this
+  # obscure use mode
+  set --
+
+  # Validate session id from form to prevent CSRF
+  # Only validate if username is present, because no username means
+  # anonymous uploads are allowed via acl and cgilite/session.sh does not
+  # validate anonymous sessions from a multipart/formdata
+  if [ "$USER_NAME" -a "$(multipart session_id)" != "$SESSION_ID" ]; then
+    rm -- "$multipart_cachefile"
+    printf 'Refresh: %i\r\n' 4
+    theme_error 403
+    return 0
+  fi
+
+  mkdir -p "$_DATA/pages${page}#attachments/"
+  n=1; while filename=$(multipart_filename "file" "$n"); do
+    filename="$(printf %s "$filename" |tr /\\0 __)"
+    set -- "$@" "pages${page}#attachments/$filename"
+    multipart "file" "$n" >"$_DATA/pages${page}#attachments/$filename"
+    n=$((n + 1))
+  done
+  rm -- "$multipart_cachefile"
+  if [ "$REV_ATTACHMENTS" = true ]; then
+    git -C "$_DATA" add -- "$@"
+    git -C "$_DATA" commit -qm "Attachments to # $page # uploaded by @ $USER_NAME @" -- "$@"
+  fi
+  REDIRECT "${_BASE}${PATH_INFO}"
+
+elif [ "$SESSION_ID" != "$tsid" ]; then
+  # Match session key from POST-Data to prevent CSRF:
+  # For authenticated users the POST session_key must match
+  # the session key used for authentication (usually from a
+  # cookie). This should ensure that POST requests were not
+  # triggered by malicious 3rd party sites freeriding on an
+  # existing user authentication.
+  # For pages that are writable by anonymous users, this is
+  # not reliable.
+
+  printf 'Refresh: %i\r\n' 4
+  theme_error 403
+  return 0
+fi
+
+if [ "$action" = delete -o "$action" = move ]; then
+  set --
+  n="$(POST_COUNT select)"; while [ $n -gt 0 ]; do
+    select="$(POST select $n |PATH)"
+    set -- "$@" "pages${page}#attachments/${select##*/}"
+    n=$((n - 1))
+  done
+fi
+
+if [ "$action" = delete ]; then
+  if [ "$REV_ATTACHMENTS" = true ]; then
+    git -C "$_DATA" rm -- "$@"
+    git -C "$_DATA" commit -qm \
+        "Attachment to # $page # deleted by @ $USER_NAME @" -- "$@"
+  else
+    ( cd "$_DATA" && rm -- "$@"; )
+  fi
+  REDIRECT "${_BASE}${PATH_INFO}"
+
+elif [ "$action" = move ]; then
+  moveto="$(POST moveto |PATH)"
+
+  if ! acl_write "$moveto"; then
+    printf 'Refresh: %i\r\n' 4
+    theme_error 403
+    return 0
+
+  elif [ ! -d "${_DATA}/pages${moveto}" ]; then
+    printf 'Refresh: %i\r\n' 4
+    theme_error 404
+    return 0
+
+  elif [ "$REV_ATTACHMENTS" = true ]; then
+    mkdir -p -- "${_DATA}/pages${moveto}/#attachments"
+    git -C "$_DATA" mv -f -- "$@" "pages${moveto}/#attachments/"
+
+    cnt=$#; while [ $cnt -gt 0 ]; do
+      set -- "$@" "$1" "pages/${moveto}/#attachments/${1##*/}"
+      cnt=$((cnt - 1)); shift 1
+    done
+
+    git -C "$_DATA" commit -qm \
+        "Attachment moved from # $page # to # $moveto # by @ $USER_NAME @" -- "$@"
+  else
+    mkdir -p -- "${_DATA}/pages${moveto}/#attachments"
+    ( cd "$_DATA" && mv -- "$@" "pages${moveto}/#attachments/"; )
+  fi
+  REDIRECT "${_BASE}${PATH_INFO}"
+
+fi
+
+return 1