GH-45: dasht-server: serve file:// URLs over HTTP

bin/dasht-server

@@ -29,42 +29,6 @@
 #
 #     dasht-server | xargs -n1 w3m
 #
-# ### Browser refuses to load `file://` links
-#
-# Some browsers refuse to load `file://` links from `http://127.0.0.1` URLs.
-# However, the following browsers do not suffer from this limitation and are
-# thereby recommended for use with the search engine provided by this script.
-#
-# Recommended terminal web browsers:
-#
-# * [w3m]( http://w3m.sourceforge.net )
-#
-# * [elinks]( http://elinks.or.cz )
-#
-# * [lynx]( http://lynx.invisible-island.net )
-#
-# Recommended graphical web browsers:
-#
-# * [Dillo]( http://www.dillo.org )
-#
-# * [NetSurf]( http://www.netsurf-browser.org )
-#
-# * [Chrome]( https://www.google.com/chrome/ ) using the [LocalLinks extension](
-#   https://chrome.google.com/webstore/detail/locallinks/jllpkdkcdjndhggodimiphkghogcpida
-#   )
-#
-# * [Firefox]( http://www.mozilla.org/firefox ) using the following workaround
-#
-# #### Firefox
-#
-# The workaround for Firefox is to add this snippet to your `prefs.js` file:
-#
-#     user_pref("capability.policy.policynames", "localfilelinks");
-#     user_pref("capability.policy.localfilelinks.sites", "http://127.0.0.1:54321");
-#     user_pref("capability.policy.localfilelinks.checkloaduri.enabled", "allAccess");
-#
-# See http://kb.mozillazine.org/Links_to_local_pages_do_not_work for details.
-#
 # ## ENVIRONMENT
 #
 # `DASHT_DOCSETS_DIR`

bin/dasht-server-http

@@ -67,12 +67,30 @@ hex2byte() {
   printf "\\$oct"
 }
 
-# parse URL out of HTTP request
+# parse URL from request: only GET is supported
 url=$(awk '
   /^GET [[:print:]]+ HTTP\/1.+\r$/ { print $2 }
   /^\r$/ { exit } # reached end of HTTP request
 ')
 
+# serve translated local file:// URLs over HTTP
+# (skip the / homepage and /? form submissions)
+if ! echo "$url" | grep -q '^/$\|^/?'; then
+  file=${url%#*} # strip URI fragment, if any
+
+  if test -f "$file"; then
+    printf 'HTTP/1.0 200 OK\r\n'
+    printf 'Content-Type: %s\r\n' "$(file -b --mime "$file" 2>&1)"
+    printf '\r\n'
+    cat "$file" 2>&1 || :
+  else
+    printf 'HTTP/1.0 400 Bad Request\r\n'
+    printf '\r\n'
+  fi
+
+  exit
+fi
+
 # parse URL query parameters as shell variables
 eval "$(
   # split URL on query parameter delimiters (?&)
@@ -184,7 +202,10 @@ HEADER
 if test $1 -eq 0; then
   # notify user when no docsets are installed so they can go install them
   echo "<h1><i>${docsets_html}</i> docsets not installed so <i>$query_html</i> not searched</h1>"
-elif ! dasht-query-html "$query" $docsets; then
+elif results_html=$(dasht-query-html "$query" $docsets); then
+  # translate local file:// URLs into HTTP ones so that we can serve them
+  echo "$results_html" | sed 's,file://,,'
+else
   # notify user when no results are found so they can refine their search
   echo "<h1><i>$query_html</i> not found in $1 docsets matching <i>${docsets_html:-.*}</i></h1>"
 fi