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3
.gitignore
vendored
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3
.gitignore
vendored
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@ -0,0 +1,3 @@
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config.json
|
||||
cache/*
|
||||
!cache/.gitkeep
|
||||
201
LICENSE
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201
LICENSE
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|
|
@ -0,0 +1,201 @@
|
|||
Apache License
|
||||
Version 2.0, January 2004
|
||||
http://www.apache.org/licenses/
|
||||
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||||
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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1. Definitions.
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END OF TERMS AND CONDITIONS
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APPENDIX: How to apply the Apache License to your work.
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To apply the Apache License to your work, attach the following
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See the License for the specific language governing permissions and
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24
README.md
Normal file
24
README.md
Normal file
|
|
@ -0,0 +1,24 @@
|
|||
# image-proxy
|
||||
|
||||
An image proxy server that resizes images before serving them.
|
||||
Intended to only be used with images that already have a consistent size (such as already processed avatars).
|
||||
|
||||
## Configuration
|
||||
|
||||
Configuration is done in a `config.json` file, with the following keys:
|
||||
|
||||
- `port`: the port the server will listen on
|
||||
- `debug`: whether the server will log all request paths and durations
|
||||
- `proxy_target`: the target for the reverse proxy, used when the requested size is the image's actual size.
|
||||
Should be the full base URL of the target server, without a trailing slash.
|
||||
- `patterns`: an array of patterns to accept
|
||||
- `input`: (string) the input regex. This should start with a `/` and use unnamed capture groups.
|
||||
- `output`: (string) the URL to rewrite the link to, using `$1` `$2` (etc) as placeholders for the capture groups.
|
||||
- `cache_key`: (string) the file name used for cached files. Must be unique across all patterns.
|
||||
- `content_type`: (string) the `Content-Type` header to return with requests.
|
||||
- `sizes`: (array of numbers) the acceptable sizes for this pattern.
|
||||
The first size in the list is the default, and will be passed through unmodified.
|
||||
|
||||
## To-do list
|
||||
|
||||
- Clean up old, unused cache entries
|
||||
0
cache/.gitkeep
vendored
Normal file
0
cache/.gitkeep
vendored
Normal file
13
config.example.json
Normal file
13
config.example.json
Normal file
|
|
@ -0,0 +1,13 @@
|
|||
{
|
||||
"port": 5170,
|
||||
"debug": true,
|
||||
"proxy_target": "https://cdn.pronouns.cc",
|
||||
"patterns": [
|
||||
{
|
||||
"input": "/users/([0-9a-v]{20})/([0-9a-f]+)\\.(webp|jpg)",
|
||||
"output": "https://cdn.pronouns.cc/users/$1/$2.$3",
|
||||
"cache_key": "user-$1-$2.$3",
|
||||
"sizes": [512, 256]
|
||||
}
|
||||
]
|
||||
}
|
||||
11
go.mod
Normal file
11
go.mod
Normal file
|
|
@ -0,0 +1,11 @@
|
|||
module codeberg.org/pronounscc/image-proxy
|
||||
|
||||
go 1.20
|
||||
|
||||
require github.com/davidbyttow/govips/v2 v2.13.0
|
||||
|
||||
require (
|
||||
golang.org/x/image v0.5.0 // indirect
|
||||
golang.org/x/net v0.7.0 // indirect
|
||||
golang.org/x/text v0.7.0 // indirect
|
||||
)
|
||||
48
go.sum
Normal file
48
go.sum
Normal file
|
|
@ -0,0 +1,48 @@
|
|||
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
|
||||
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
|
||||
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
|
||||
github.com/davidbyttow/govips/v2 v2.13.0 h1:5MK9ZcXZC5GzUR9Ca8fJwOYqMgll/H096ec0PJP59QM=
|
||||
github.com/davidbyttow/govips/v2 v2.13.0/go.mod h1:LPTrwWtNa5n4yl9UC52YBOEGdZcY5hDTP4Ms2QWasTw=
|
||||
github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
|
||||
github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
|
||||
github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e/go.mod h1:zD1mROLANZcx1PVRCS0qkT7pwLkGfwJo4zjcN/Tysno=
|
||||
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
|
||||
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
|
||||
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
|
||||
github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd0=
|
||||
github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
|
||||
github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
|
||||
golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
|
||||
golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
|
||||
golang.org/x/image v0.5.0 h1:5JMiNunQeQw++mMOz48/ISeNu3Iweh/JaZU8ZLqHRrI=
|
||||
golang.org/x/image v0.5.0/go.mod h1:FVC7BI/5Ym8R25iw5OLsgshdUBbT1h5jZTpA+mvAdZ4=
|
||||
golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
|
||||
golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
|
||||
golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
|
||||
golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
|
||||
golang.org/x/net v0.7.0 h1:rJrUqqhjsgNp7KqAIc25s9pZnjU7TUcSY7HcVZjdn1g=
|
||||
golang.org/x/net v0.7.0/go.mod h1:2Tu9+aMcznHK/AK1HMvgo6xiTLG5rD5rZLDS+rp2Bjs=
|
||||
golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
|
||||
golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
|
||||
golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
|
||||
golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
|
||||
golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
|
||||
golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
|
||||
golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
|
||||
golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
|
||||
golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
|
||||
golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
|
||||
golang.org/x/term v0.5.0/go.mod h1:jMB1sMXY+tzblOD4FWmEbocvup2/aLOaQEp7JmGp78k=
|
||||
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
|
||||
golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
|
||||
golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
|
||||
golang.org/x/text v0.7.0 h1:4BRB4x83lYWy72KwLD/qYDuTu7q9PjSagHvijDw7cLo=
|
||||
golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
|
||||
golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
|
||||
golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
|
||||
golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
|
||||
golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
|
||||
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
|
||||
gopkg.in/check.v1 v1.0.0-20200902074654-038fdea0a05b/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
|
||||
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
|
||||
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
|
||||
224
handler.go
Normal file
224
handler.go
Normal file
|
|
@ -0,0 +1,224 @@
|
|||
// SPDX-License-Identifier: Apache-2.0
|
||||
package main
|
||||
|
||||
import (
|
||||
"context"
|
||||
"errors"
|
||||
"fmt"
|
||||
"io"
|
||||
"log"
|
||||
"net/http"
|
||||
"net/http/httputil"
|
||||
"os"
|
||||
"regexp"
|
||||
"strconv"
|
||||
"time"
|
||||
|
||||
"github.com/davidbyttow/govips/v2/vips"
|
||||
)
|
||||
|
||||
type Handler struct {
|
||||
// Port is the port to serve on.
|
||||
Port int `json:"port"`
|
||||
// Whether to log debug messages
|
||||
Debug bool `json:"debug"`
|
||||
// Patterns is an array of image URL patterns to serve.
|
||||
Patterns []pattern `json:"patterns"`
|
||||
// ProxyTarget is the host that requests for the default image size will be rewritten to.
|
||||
ProxyTarget string `json:"proxy_target"`
|
||||
proxy *httputil.ReverseProxy
|
||||
}
|
||||
|
||||
type pattern struct {
|
||||
Input string `json:"input"`
|
||||
Output string `json:"output"`
|
||||
CacheKey string `json:"cache_key"`
|
||||
ContentType string `json:"content_type"`
|
||||
Sizes []int `json:"sizes"`
|
||||
regexp *regexp.Regexp
|
||||
}
|
||||
|
||||
func (p *pattern) acceptsSize(size int) bool {
|
||||
for i := range p.Sizes {
|
||||
if p.Sizes[i] == size {
|
||||
return true
|
||||
}
|
||||
}
|
||||
return false
|
||||
}
|
||||
|
||||
// The proxy handler entrypoint. This handles rewriting the URL to the original image, and
|
||||
func (hn *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
|
||||
var pattern *pattern
|
||||
for i := range hn.Patterns {
|
||||
if hn.Patterns[i].regexp.MatchString(r.URL.Path) {
|
||||
pattern = &hn.Patterns[i]
|
||||
break
|
||||
}
|
||||
}
|
||||
|
||||
if pattern == nil {
|
||||
http.Error(w, "Invalid image URL", http.StatusBadRequest)
|
||||
return
|
||||
}
|
||||
|
||||
var size int
|
||||
if s := r.FormValue("size"); s != "" {
|
||||
i, err := strconv.Atoi(s)
|
||||
if err != nil {
|
||||
http.Error(w, "Invalid image size", http.StatusBadRequest)
|
||||
return
|
||||
}
|
||||
size = i
|
||||
} else {
|
||||
size = pattern.Sizes[0]
|
||||
}
|
||||
|
||||
if !pattern.acceptsSize(size) {
|
||||
http.Error(w, "Invalid image size", http.StatusBadRequest)
|
||||
return
|
||||
}
|
||||
|
||||
// If the requested size is the default, just proxy the request
|
||||
if size == pattern.Sizes[0] {
|
||||
if hn.Debug {
|
||||
log.Printf("[DEBUG] Proxying image %q as it has default size of %v", r.URL.Path, size)
|
||||
}
|
||||
hn.proxy.ServeHTTP(w, r)
|
||||
return
|
||||
}
|
||||
|
||||
url := pattern.regexp.ReplaceAllString(r.URL.Path, pattern.Output)
|
||||
cacheKey := pattern.regexp.ReplaceAllString(r.URL.Path, pattern.CacheKey)
|
||||
|
||||
if hn.Debug {
|
||||
log.Printf("[DEBUG] Resizing image %q to size %v and serving it", r.URL.Path, size)
|
||||
}
|
||||
|
||||
hn.proxyImage(r.Context(), w, cacheKey, url, pattern.ContentType, size)
|
||||
}
|
||||
|
||||
func (hn *Handler) proxyImage(ctx context.Context, w http.ResponseWriter, cacheKey, url, contentType string, size int) {
|
||||
// Check if we've cached the image
|
||||
cacheName := fmt.Sprintf("cache/%v/%v", size, cacheKey)
|
||||
cacheFile, err := os.Open(cacheName)
|
||||
if err == nil {
|
||||
defer func() {
|
||||
err := cacheFile.Close()
|
||||
if err != nil {
|
||||
log.Printf("error closing file %q: %v", cacheName, err)
|
||||
}
|
||||
}()
|
||||
|
||||
fi, err := cacheFile.Stat()
|
||||
if err != nil {
|
||||
log.Printf("error getting file info for file %q: %v", cacheName, err)
|
||||
return
|
||||
}
|
||||
|
||||
// If so, just copy it to the output
|
||||
w.Header().Add("Content-Type", contentType)
|
||||
w.Header().Add("Content-Length", strconv.FormatInt(fi.Size(), 10))
|
||||
_, err = io.Copy(w, cacheFile)
|
||||
if err != nil {
|
||||
log.Printf("error serving cached file %q: %v", cacheName, err)
|
||||
}
|
||||
return
|
||||
} else {
|
||||
if !errors.Is(err, os.ErrNotExist) {
|
||||
log.Printf("error opening cache file %q: %v", cacheName, err)
|
||||
http.Error(w, "Internal server error", http.StatusInternalServerError)
|
||||
return
|
||||
}
|
||||
}
|
||||
|
||||
// Otherwise, fall back to fetching the image + resizing it
|
||||
start := time.Now()
|
||||
|
||||
req, err := http.NewRequestWithContext(ctx, "GET", url, nil)
|
||||
if err != nil {
|
||||
log.Printf("creating request: %v", err)
|
||||
http.Error(w, "Internal server error", http.StatusInternalServerError)
|
||||
return
|
||||
}
|
||||
|
||||
resp, err := http.DefaultClient.Do(req)
|
||||
if err != nil {
|
||||
log.Printf("executing request: %v", err)
|
||||
http.Error(w, "Internal server error", http.StatusInternalServerError)
|
||||
return
|
||||
}
|
||||
switch resp.StatusCode {
|
||||
case http.StatusOK:
|
||||
case http.StatusNotFound:
|
||||
http.Error(w, "Not found", http.StatusNotFound)
|
||||
return
|
||||
default:
|
||||
http.Error(w, "Internal server error", http.StatusInternalServerError)
|
||||
return
|
||||
}
|
||||
defer resp.Body.Close()
|
||||
|
||||
image, err := vips.NewImageFromReader(resp.Body)
|
||||
if err != nil {
|
||||
log.Printf("creating vips image: %v", err)
|
||||
http.Error(w, "Internal server error", http.StatusInternalServerError)
|
||||
return
|
||||
}
|
||||
|
||||
err = image.ThumbnailWithSize(size, size, vips.InterestingCentre, vips.SizeBoth)
|
||||
if err != nil {
|
||||
log.Printf("resizing vips image: %v", err)
|
||||
http.Error(w, "Internal server error", http.StatusInternalServerError)
|
||||
return
|
||||
}
|
||||
|
||||
out, _, err := export(image, contentType)
|
||||
if err != nil {
|
||||
log.Printf("exporting vips image: %v", err)
|
||||
http.Error(w, "Internal server error", http.StatusInternalServerError)
|
||||
return
|
||||
}
|
||||
|
||||
if hn.Debug {
|
||||
log.Printf("resized image %q in %v", cacheKey, time.Since(start).Round(time.Microsecond))
|
||||
}
|
||||
|
||||
go func(b []byte) {
|
||||
err = os.WriteFile(cacheName, b, 0o644)
|
||||
if err != nil {
|
||||
log.Printf("writing image to cache: %v", err)
|
||||
return
|
||||
}
|
||||
}(out)
|
||||
|
||||
w.Header().Add("Content-Type", contentType)
|
||||
w.Header().Add("Content-Length", strconv.Itoa(len(out)))
|
||||
_, err = w.Write(out)
|
||||
if err != nil {
|
||||
log.Printf("error writing resized file to response: %v", err)
|
||||
}
|
||||
}
|
||||
|
||||
func export(image *vips.ImageRef, contentType string) ([]byte, *vips.ImageMetadata, error) {
|
||||
switch contentType {
|
||||
case "image/webp":
|
||||
params := vips.NewWebpExportParams()
|
||||
params.Quality = 90
|
||||
return image.ExportWebp(params)
|
||||
case "image/jpeg":
|
||||
params := vips.NewJpegExportParams()
|
||||
params.Quality = 90
|
||||
return image.ExportJpeg(params)
|
||||
case "image/png":
|
||||
params := vips.NewPngExportParams()
|
||||
params.Quality = 90
|
||||
return image.ExportPng(params)
|
||||
case "image/gif":
|
||||
params := vips.NewGifExportParams()
|
||||
params.Quality = 90
|
||||
return image.ExportGIF(params)
|
||||
}
|
||||
|
||||
return nil, nil, errors.New("invalid image content type")
|
||||
}
|
||||
74
main.go
Normal file
74
main.go
Normal file
|
|
@ -0,0 +1,74 @@
|
|||
// SPDX-License-Identifier: Apache-2.0
|
||||
package main
|
||||
|
||||
import (
|
||||
"encoding/json"
|
||||
"errors"
|
||||
"log"
|
||||
"net/http"
|
||||
"net/http/httputil"
|
||||
"net/url"
|
||||
"os"
|
||||
"regexp"
|
||||
"strconv"
|
||||
|
||||
"github.com/davidbyttow/govips/v2/vips"
|
||||
)
|
||||
|
||||
func main() {
|
||||
// set vips log level to WARN, else it will spam logs on info level
|
||||
vips.LoggingSettings(nil, vips.LogLevelWarning)
|
||||
|
||||
vips.Startup(nil)
|
||||
defer vips.Shutdown()
|
||||
|
||||
// read config file and parse it
|
||||
confB, err := os.ReadFile("config.json")
|
||||
if err != nil {
|
||||
log.Fatalf("reading config.json: %v", err)
|
||||
}
|
||||
|
||||
hn := &Handler{}
|
||||
err = json.Unmarshal(confB, hn)
|
||||
if err != nil {
|
||||
log.Fatalf("unmarshaling config.json: %v", err)
|
||||
}
|
||||
|
||||
// Construct reverse proxy for bare/default size images
|
||||
proxyURL, err := url.Parse(hn.ProxyTarget)
|
||||
if err != nil {
|
||||
log.Fatalf("parsing proxy_target as URL: %v", err)
|
||||
}
|
||||
hn.proxy = &httputil.ReverseProxy{
|
||||
Rewrite: func(pr *httputil.ProxyRequest) {
|
||||
pr.SetURL(proxyURL)
|
||||
pr.Out.URL.RawQuery = ""
|
||||
},
|
||||
}
|
||||
|
||||
// compile patterns
|
||||
for i, pattern := range hn.Patterns {
|
||||
if len(pattern.Sizes) <= 1 {
|
||||
log.Fatalf("pattern %d (%q) has too few possible sizes", i+1, pattern.Input)
|
||||
}
|
||||
|
||||
hn.Patterns[i].regexp = regexp.MustCompile(pattern.Input)
|
||||
}
|
||||
|
||||
// create directories for all image sizes
|
||||
for _, pattern := range hn.Patterns {
|
||||
for _, size := range pattern.Sizes {
|
||||
err := os.Mkdir("cache/"+strconv.Itoa(size), 0o755)
|
||||
if err != nil && !errors.Is(err, os.ErrExist) {
|
||||
log.Fatalf("creating cache directory %q: %v", "cache/"+strconv.Itoa(size), err)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
log.Printf("serving on port %v", hn.Port)
|
||||
|
||||
err = http.ListenAndServe(":"+strconv.Itoa(hn.Port), hn)
|
||||
if err != nil {
|
||||
log.Fatalf("listening on port %v: %v", hn.Port, err)
|
||||
}
|
||||
}
|
||||
Loading…
Reference in a new issue