eCAP EXIF metadata filter
eCAP adapter for stripping EXIF and other metadata from files, primarly JPEG.
Installation
libecap and several other dependencies are required to build and use the adapter. libecap is available at http://e-cap.org/.
Dependencies:
- exiv2
- taglib
- libzip
- podofo
The adapter can be built and installed from sources, usually by running:
$ ./bootstrap.sh
$ ./configure
$ make
$ make install
Configuration
tmp_filename_format
Set the format of temporary files that will be processed by the adapter.memory_filesize_limit
Files with size greater than limit will be stored in temporary disk storage, otherwise processing will be done in RAM.exclude_types
List of semicolon seprated MIME types which shouldn't be handled by adapter.
Supported MIME types
- image/jpeg
- image/x-exv
- image/x-canon-cr2
- image/x-canon-crw
- image/tiff
- image/x-nikon-nef
- image/x-pentax-pef
- image/x-samsung-srw
- image/x-olympus-orf
- image/png
- image/pgf
- application/rdf+xml
- image/x-photoshop
- image/jp2
- audio/3gpp
- audio/3gpp2
- video/3gpp
- video/3gpp2
- audio/mp4
- audio/mp4a-latm
- audio/x-m4a
- video/mp4
- video/quicktime
- audio/mpeg
- audio/ogg
- application/pdf
- application/vnd.oasis.opendocument.text
- application/vnd.oasis.opendocument.presentation
- application/vnd.oasis.opendocument.spreadsheet
- application/vnd.oasis.opendocument.graphics
- application/vnd.openxmlformats-officedocument.wordprocessingml.document
- application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
- application/vnd.openxmlformats-officedocument.presentationml.presentation
Adapter is capable of processing messages with MIME type multipart/form-data by parsing the message and applying corresponding filter for every part of the message.
Messages with MIME type application/octet-stream are handled in a special way by checking actual type of the message content and applying corresonding filter (if any).
Squid configuration
Example configuration for stripping metadata from outgoing requests.
ecap_enable on
loadable_modules /usr/local/lib/ecap_adapter_exif.so
ecap_service eReqmod reqmod_precache 0 ecap://sterch.net/ecap/services/exif-filter
adaptation_service_set reqFilter eReqmod
adaptation_access reqFilter allow all
To log debug messages use:
debug_options ALL,1 93,9