go-camo

An SSL/TLS proxy for insecure static assets to circumvent mixed content warnings. Based on go-camo, and camo.

About

This is Arachnys' version of go-camo. See https://github.com/cactus/go-camo/ for more information.

Differences from Upstream

The fundamental value proposition remains the same as the original project. That is, to proxy non-secure images over SSL/TLS, particularly to circumvent mixed content warnings on secure pages.

There are however, some crucial changes, and improvements:

• Support for proxying fonts, stylesheets, and URLs in stylesheets
• Support for proxying gzipped stylesheets
• Support for protocol-relative URLs / URLs without a scheme
• Support for proxying data URIs
• Support for proxying bad SSL/TLS URIs
• Higher default timeout
• Sentry for crash reporting, and aggregation
• End-to-end health check endpoint (/health)
• Go's dep (and vanilla tooling) is used instead of gb for dependency management
• goreleaser is used instead of gb, and the Makefile for building binaries
• Support for graceful shutdown via termination signals
• Support for Docker (docker pull arachnysdocker/go-camo)

Differences from Camo

See https://github.com/cactus/go-camo#differences-from-camo.

Usage

Releases are managed by goreleaser.

Pre-built binaries

Download the tarball appropriate for your OS from releases. Extract, and copy files to desired locations.

Docker

# Server
docker run -t --rm -p 8080:8080 arachnysdocker/go-camo:<tag> -k <hmac key>

# URL tool
docker run -t --rm arachnysdocker/go-camo-url-tool:<tag> -k <hmac key>

Set <tag> to a version in the releases or set it to latest. For stability, we do not recommend using latest as there may be breaking changes. Use a tagged release.

Configuration

# Binary
go-camo -h

# Docker
docker run -t --rm -p 8080:8080 arachnysdocker/go-camo:<tag> -h

Environment Variables:

• GOCAMO_HMAC: HMAC key used for encoding / decoding URLs

Development

Run make to show all available targets. Alternatively, see Makefile.

To get an idea of what is needed for localhost development, see .travis.yml.