rudimantary support for byte ranges

[cgilite] / static.sh

diff --git a/static.sh b/static.sh
index 153cce0e7428f717a64d7fa1ac95103d77808a57..6e9ceb773788905a21f092db87d3691397ae42dd 100755 (executable)
--- a/static.sh
+++ b/static.sh
@@ -19,7 +19,7 @@
 
 
 unset length date file suffix
-file="$_EXEC/static/$STATIC"
+file="$1"
 date="$(stat -c %Y "$file")"
 
 # allow overriding magic file recognition
@@ -27,17 +27,39 @@ date="$(stat -c %Y "$file")"
 declare -A suffix
 suffix[css]="text/css"
 
+[ -n "$HTTP_IF_MODIFIED_SINCE" ] && cachedate="$(date -d "$HTTP_IF_MODIFIED_SINCE" +%s)"
+
+if printf '%s' "${HTTP_RANGE}" |grep -qE '^bytes=[0-9]+-[0-9]*\r?$'; then
+  _range="${HTTP_RANGE#bytes=}"
+  _bstart="${_range%-*}"
+  _bend="${_range#*-}"
+fi
+
 if [ -x "$file" -o \! -r "$file" -o \! -f "$file" ]; then
-  printf 'HTTP/1.1 403 Forbidden\n\n'
-elif [ "$date" = "$HTTP_IF_NONE_MATCH" ]; then
-  printf 'HTTP/1.1 304 Not Modified\n\n'
+  printf 'Status:403 Forbidden\r\n\r\n'
+elif [ "$date" = "$cachedate" ]; then
+  printf 'Status:304 Not Modified\r\n'
+  printf 'Last-Modified: %s\r\n\r\n' "$(date -Rd "@$date")"
+elif [ "$_bstart" -gt 0 ] ; then
+  length="$(stat -c %s "$file")"
+  magic="${suffix[${file##*.}]:-$(file -bi "$file")}"
+
+  printf 'Status:206 Partial Content\r\n'
+  printf 'Last-Modified: %s\r\n' "$(date -Rd "@$date")"
+  printf 'Content-Type: %s\r\n' "${magic:-all/all}"
+  printf 'Content-Range: bytes %i-%i/%i\r\n' $_bstart $(($length - 1)) $length |debug
+  printf 'Content-Length: %i\r\n' $(($length - $_bstart))
+  printf '\r\n'
+
+  tail -c+"$(($_bstart + 1))" "$file"
 else
   length="$(stat -c %s "$file")"
   magic="${suffix[${file##*.}]:-$(file -bi "$file")}"
 
-  printf 'Etag: %s\r\n' "$date"
+  printf 'Accept-Ranges: bytes\r\n'
+  printf 'Last-Modified: %s\r\n' "$(date -Rd "@$date")"
   printf 'Content-Type: %s\r\n' "${magic:-all/all}"
-  printf 'Content-Length: %s\r\n' "$length"
+  printf 'Content-Length: %i\r\n' "$length"
   printf '\r\n'
 
   cat "$file"