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add -forceCache flag to override no-store and private directives

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The httpcache package is intended only to be used in private caches, so
it will cache responses marked `private` like normal.  However,
imageproxy is a shared cache, so these response should not be cached
under normal circumstances.  This change introduces a potentially
breaking change to start respecting the `private` cache directive in
responses.

This also adds a new `-forceCache` flag to ignore the `private` and
`no-store` directives, and cache all responses regardless.
This commit is contained in:
Will Norris 2025-05-01 02:26:20 -07:00
parent 8170536e41
commit 1ceba2538c
5 changed files with 104 additions and 16 deletions
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2
cmd/imageproxy/main.go
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@ -47,6 +47,7 @@ var _ = flag.Bool("version", false, "Deprecated: this flag does nothing")
var contentTypes = flag.String("contentTypes", "image/*", "comma separated list of allowed content types")
var userAgent = flag.String("userAgent", "willnorris/imageproxy", "specify the user-agent used by imageproxy when fetching images from origin website")
var minCacheDuration = flag.Duration("minCacheDuration", 0, "minimum duration to cache remote images")
var forceCache = flag.Bool("forceCache", false, "Ignore no-store and private directives in responses")
func init() {
flag.Var(&cache, "cache", "location to cache images (see https://github.com/willnorris/imageproxy#cache)")
@ -89,6 +90,7 @@ func main() {
p.Verbose = *verbose
p.UserAgent = *userAgent
p.MinimumCacheDuration = *minCacheDuration
p.ForceCache = *forceCache
server := &http.Server{
Addr: *addr,