From c56ac4568d91019ac3d31cca520602643d3d5626 Mon Sep 17 00:00:00 2001
From: Henry <chocolatkey@gmail.com>
Date: Tue, 25 Feb 2025 19:46:19 -0800
Subject: [PATCH 1/4] Alter SnifferFileContent to work with fs.File
---
pkg/mediatype/mediatype_of.go | 16 +++++++--
pkg/mediatype/sniffer_content.go | 62 ++++++++++++++++++++++++++------
pkg/mediatype/sniffer_context.go | 2 +-
3 files changed, 66 insertions(+), 14 deletions(-)
diff --git a/pkg/mediatype/mediatype_of.go b/pkg/mediatype/mediatype_of.go
index eb3640c9..6f4cf2f1 100644
--- a/pkg/mediatype/mediatype_of.go
+++ b/pkg/mediatype/mediatype_of.go
@@ -1,6 +1,7 @@
package mediatype
import (
+ "io/fs"
"os"
"path/filepath"
)
@@ -126,9 +127,18 @@ func OfExtension(extension string) *MediaType {
}
// Resolves a format from a file
-func OfFile(file *os.File, mediaTypes []string, extensions []string, sniffers []Sniffer) *MediaType {
+func OfFile(file fs.File, mediaTypes []string, extensions []string, sniffers []Sniffer) *MediaType {
if file != nil {
- ext := filepath.Ext(file.Name())
+ var ext string
+ if of, ok := file.(*os.File); ok {
+ ext = filepath.Ext(of.Name())
+ } else {
+ stat, err := file.Stat()
+ if err == nil {
+ ext = filepath.Ext(stat.Name())
+ }
+ }
+
if ext != "" {
ext = ext[1:] // Remove the leading "."
if extensions == nil {
@@ -143,7 +153,7 @@ func OfFile(file *os.File, mediaTypes []string, extensions []string, sniffers []
}
// Resolves a format from a file, and nothing else
-func OfFileOnly(file *os.File) *MediaType {
+func OfFileOnly(file fs.File) *MediaType {
return OfFile(file, nil, nil, Sniffers)
}
diff --git a/pkg/mediatype/sniffer_content.go b/pkg/mediatype/sniffer_content.go
index e72782cb..166eb6f3 100644
--- a/pkg/mediatype/sniffer_content.go
+++ b/pkg/mediatype/sniffer_content.go
@@ -4,6 +4,7 @@ import (
"bufio"
"bytes"
"io"
+ "io/fs"
"os"
)
@@ -14,10 +15,12 @@ type SnifferContent interface {
// Used to sniff a local file.
type SnifferFileContent struct {
- file *os.File
+ file fs.File
+ name *string
+ buffer []byte
}
-func NewSnifferFileContent(file *os.File) SnifferFileContent {
+func NewSnifferFileContent(file fs.File) SnifferFileContent {
return SnifferFileContent{file: file}
}
@@ -25,7 +28,6 @@ const MaxReadSize = 5 * 1024 * 1024 // 5MB
// Read implements SnifferContent
func (s SnifferFileContent) Read() []byte {
- s.file.Seek(0, io.SeekStart)
info, err := s.file.Stat()
if err != nil {
return nil
@@ -33,18 +35,58 @@ func (s SnifferFileContent) Read() []byte {
if info.Size() > MaxReadSize {
return nil
}
- data := make([]byte, info.Size())
- _, err = s.file.Read(data)
- if err != nil && err != io.EOF {
- return nil
+
+ if of, ok := s.file.(io.ReadSeeker); ok {
+ of.Seek(0, io.SeekStart)
+ data := make([]byte, info.Size())
+ _, err = s.file.Read(data)
+ if err != nil && err != io.EOF {
+ return nil
+ }
+ return data
+ } else {
+ if s.buffer == nil {
+ s.buffer = make([]byte, info.Size())
+ _, err = s.file.Read(s.buffer)
+ if err != nil && err != io.EOF {
+ return nil
+ }
+ }
+ return s.buffer
}
- return data
}
// Stream implements SnifferContent
func (s SnifferFileContent) Stream() io.Reader {
- s.file.Seek(0, io.SeekStart)
- return bufio.NewReader(s.file)
+ if of, ok := s.file.(*os.File); ok {
+ of.Seek(0, io.SeekStart)
+ return bufio.NewReader(s.file)
+ } else {
+ if r := s.Read(); r != nil {
+ return bytes.NewReader(r)
+ }
+ return nil
+ }
+}
+
+func (s *SnifferFileContent) Name() string {
+ if s.name != nil {
+ return *s.name
+ }
+
+ if of, ok := s.file.(*os.File); ok {
+ name := of.Name()
+ s.name = &name
+ return name
+ } else {
+ info, err := s.file.Stat()
+ if err != nil {
+ return ""
+ }
+ name := info.Name()
+ s.name = &name
+ return name
+ }
}
// Used to sniff a byte array.
diff --git a/pkg/mediatype/sniffer_context.go b/pkg/mediatype/sniffer_context.go
index 53da2d15..ce56061d 100644
--- a/pkg/mediatype/sniffer_context.go
+++ b/pkg/mediatype/sniffer_context.go
@@ -163,7 +163,7 @@ func (s *SnifferContext) ContentAsArchive() (archive.Archive, error) {
case SnifferFileContent:
{
fileSniffer := s.content.(SnifferFileContent)
- a, err := archive.NewArchiveFactory().Open(fileSniffer.file.Name(), "")
+ a, err := archive.NewArchiveFactory().Open(fileSniffer.Name(), "")
if err != nil {
return nil, err
}
From f7154070a934280e030160fa3768d110b9cbaf19 Mon Sep 17 00:00:00 2001
From: Henry <chocolatkey@gmail.com>
Date: Tue, 25 Feb 2025 19:46:32 -0800
Subject: [PATCH 2/4] Add size property to Link
---
pkg/manifest/link.go | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/pkg/manifest/link.go b/pkg/manifest/link.go
index 011233d3..40f07ed7 100644
--- a/pkg/manifest/link.go
+++ b/pkg/manifest/link.go
@@ -19,6 +19,7 @@ type Link struct {
Properties Properties `json:"properties,omitempty"` // Properties associated to the linked resource.
Height uint `json:"height,omitempty"` // Height of the linked resource in pixels.
Width uint `json:"width,omitempty"` // Width of the linked resource in pixels.
+ Size uint `json:"size,omitempty"` // Original size of the resource in bytes.
Bitrate float64 `json:"bitrate,omitempty"` // Bitrate of the linked resource in kbps.
Duration float64 `json:"duration,omitempty"` // Length of the linked resource in seconds.
Languages Strings `json:"language,omitempty"` // Expected language of the linked resource (BCP 47 tag).
@@ -68,6 +69,7 @@ func LinkFromJSON(rawJson map[string]interface{}) (*Link, error) {
Title: parseOptString(rawJson["title"]),
Height: float64ToUint(parseOptFloat64(rawJson["height"])),
Width: float64ToUint(parseOptFloat64(rawJson["width"])),
+ Size: float64ToUint(parseOptFloat64(rawJson["size"])),
Bitrate: float64Positive(parseOptFloat64(rawJson["bitrate"])),
Duration: float64Positive(parseOptFloat64(rawJson["duration"])),
}
@@ -183,6 +185,9 @@ func (l Link) MarshalJSON() ([]byte, error) {
if l.Width > 0 {
res["width"] = l.Width
}
+ if l.Size > 0 {
+ res["size"] = l.Size
+ }
if l.Bitrate > 0 {
res["bitrate"] = l.Bitrate
}
From f9184ca684e6b92c9bb772c27ca30132b68d71dd Mon Sep 17 00:00:00 2001
From: Henry <chocolatkey@gmail.com>
Date: Tue, 25 Feb 2025 19:46:48 -0800
Subject: [PATCH 3/4] Prevent panic when HREF string is empty
---
pkg/manifest/href.go | 3 +++
1 file changed, 3 insertions(+)
diff --git a/pkg/manifest/href.go b/pkg/manifest/href.go
index d3ca7cfa..90c4ab45 100644
--- a/pkg/manifest/href.go
+++ b/pkg/manifest/href.go
@@ -104,5 +104,8 @@ func (h HREF) String() string {
if h.IsTemplated() {
return h.template
}
+ if h.href == nil {
+ return ""
+ }
return h.href.String()
}
From c132136a91a94983cf3702a76511de88947a54ca Mon Sep 17 00:00:00 2001
From: Henry <chocolatkey@gmail.com>
Date: Tue, 25 Feb 2025 19:49:38 -0800
Subject: [PATCH 4/4] Add WIP image analyzer
---
cmd/analyzer/main.go | 32 ++++
go.mod | 17 ++-
go.sum | 226 ++++++++++++++++++++++++++++-
pkg/analyzer/image.go | 330 ++++++++++++++++++++++++++++++++++++++++++
4 files changed, 595 insertions(+), 10 deletions(-)
create mode 100644 cmd/analyzer/main.go
create mode 100644 pkg/analyzer/image.go
diff --git a/cmd/analyzer/main.go b/cmd/analyzer/main.go
new file mode 100644
index 00000000..041b0ec2
--- /dev/null
+++ b/cmd/analyzer/main.go
@@ -0,0 +1,32 @@
+package main
+
+import (
+ "encoding/json"
+ "os"
+
+ "github.com/readium/go-toolkit/pkg/analyzer"
+ "github.com/readium/go-toolkit/pkg/manifest"
+)
+
+func main() {
+ if len(os.Args) < 2 {
+ panic("usage: " + os.Args[0] + " <test dir image name>")
+ }
+
+ r, err := os.OpenRoot("./test")
+ if err != nil {
+ panic(err)
+ }
+ defer r.Close()
+ fs := r.FS()
+
+ link, _, err := analyzer.Image(fs, manifest.Link{
+ Href: manifest.MustNewHREFFromString(os.Args[1], false),
+ }, true)
+ if err != nil {
+ panic(err)
+ }
+
+ bin, _ := json.Marshal(link)
+ println(string(bin))
+}
diff --git a/go.mod b/go.mod
index 3906b8cd..db65f0de 100644
--- a/go.mod
+++ b/go.mod
@@ -1,17 +1,19 @@
module github.com/readium/go-toolkit
-go 1.22.0
-
-toolchain go1.23.5
+go 1.24.0
require (
github.com/CAFxX/httpcompression v0.0.9
github.com/agext/regexp v1.3.0
github.com/andybalholm/cascadia v1.3.3
+ github.com/azr/phash v0.2.0
+ github.com/bbrks/go-blurhash v1.1.1
github.com/deckarep/golang-set v1.8.0
+ github.com/disintegration/imaging v1.6.2
github.com/go-viper/mapstructure/v2 v2.2.1
github.com/gorilla/mux v1.8.1
github.com/gotd/contrib v0.21.0
+ github.com/kettek/apng v0.0.0-20220823221153-ff692776a607
github.com/pdfcpu/pdfcpu v0.9.1
github.com/pkg/errors v0.9.1
github.com/readium/xmlquery v0.0.0-20230106230237-8f493145aef4
@@ -21,14 +23,17 @@ require (
github.com/trimmer-io/go-xmp v1.0.0
github.com/vmihailenco/go-tinylfu v0.2.2
github.com/zeebo/xxh3 v1.0.2
+ go4.org v0.0.0-20230225012048-214862532bf5
golang.org/x/exp v0.0.0-20250128182459-e0ece0dbea4c
+ golang.org/x/image v0.23.0
golang.org/x/net v0.34.0
- golang.org/x/text v0.21.0
+ golang.org/x/text v0.22.0
)
require (
github.com/andybalholm/brotli v1.1.1 // indirect
github.com/antchfx/xpath v1.3.3 // indirect
+ github.com/azr/gift v1.1.2 // indirect
github.com/cespare/xxhash/v2 v2.3.0 // indirect
github.com/davecgh/go-spew v1.1.1 // indirect
github.com/golang/groupcache v0.0.0-20241129210726-2c02b8208cf8 // indirect
@@ -39,9 +44,7 @@ require (
github.com/klauspost/cpuid/v2 v2.2.9 // indirect
github.com/pmezard/go-difflib v1.0.0 // indirect
github.com/spf13/pflag v1.0.6 // indirect
- golang.org/x/image v0.23.0 // indirect
- golang.org/x/sys v0.29.0 // indirect
- gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 // indirect
+ golang.org/x/sys v0.30.0 // indirect
gopkg.in/yaml.v2 v2.4.0 // indirect
gopkg.in/yaml.v3 v3.0.1 // indirect
)
diff --git a/go.sum b/go.sum
index 35822bd4..f9d131cf 100644
--- a/go.sum
+++ b/go.sum
@@ -1,3 +1,22 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
+cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
+cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
+cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
+cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
+cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
+cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE=
+cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
+cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
+cloud.google.com/go/pubsub v1.1.0/go.mod h1:EwwdRX2sKPjnvnqCa270oGRyludottCI76h+R3AArQw=
+cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
+cloud.google.com/go/storage v1.5.0/go.mod h1:tpKbwo567HUNpVclU5sGELwQWBDZ8gh0ZeosJ0Rtdos=
+dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
github.com/CAFxX/httpcompression v0.0.9 h1:0ue2X8dOLEpxTm8tt+OdHcgA+gbDge0OqFQWGKSqgrg=
github.com/CAFxX/httpcompression v0.0.9/go.mod h1:XX8oPZA+4IDcfZ0A71Hz0mZsv/YJOgYygkFhizVPilM=
github.com/agext/regexp v1.3.0 h1:6+9tp+S41TU48gFNV47bX+pp1q7WahGofw6JccmsCDs=
@@ -10,43 +29,97 @@ github.com/andybalholm/cascadia v1.3.3/go.mod h1:xNd9bqTn98Ln4DwST8/nG+H0yuB8Hmg
github.com/antchfx/xpath v1.2.1/go.mod h1:i54GszH55fYfBmoZXapTHN8T8tkcHfRgLyVwwqzXNcs=
github.com/antchfx/xpath v1.3.3 h1:tmuPQa1Uye0Ym1Zn65vxPgfltWb/Lxu2jeqIGteJSRs=
github.com/antchfx/xpath v1.3.3/go.mod h1:i54GszH55fYfBmoZXapTHN8T8tkcHfRgLyVwwqzXNcs=
+github.com/azr/gift v1.1.2 h1:EbQ8/1QMtDfz5Beqg+RY5F21KbwGhE8aWSEbF1pp95A=
+github.com/azr/gift v1.1.2/go.mod h1:bDKvjyxgachY3zdk831G99y+VANype25eu37uhm3khI=
+github.com/azr/phash v0.2.0 h1:F6qkeYlwuMUMkUAJkQFElGrQzFnneJwV+L23VrEQ0cU=
+github.com/azr/phash v0.2.0/go.mod h1:vUennaUN3i09UA33YxHpCR5l2CeENoCRB2Jo6pvWNf4=
+github.com/bbrks/go-blurhash v1.1.1 h1:uoXOxRPDca9zHYabUTwvS4KnY++KKUbwFo+Yxb8ME4M=
+github.com/bbrks/go-blurhash v1.1.1/go.mod h1:lkAsdyXp+EhARcUo85yS2G1o+Sh43I2ebF5togC4bAY=
+github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
+github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
+github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
+github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
+github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
github.com/cpuguy83/go-md2man/v2 v2.0.4/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
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/deckarep/golang-set v1.8.0 h1:sk9/l/KqpunDwP7pSjUg0keiOOLEnOBHzykLrsPppp4=
github.com/deckarep/golang-set v1.8.0/go.mod h1:5nI87KwE7wgsBU1F4GKAw2Qod7p5kyS383rP6+o6qqo=
+github.com/disintegration/imaging v1.6.2 h1:w1LecBlG2Lnp8B3jk5zSuNqd7b4DXhcjwek1ei82L+c=
+github.com/disintegration/imaging v1.6.2/go.mod h1:44/5580QXChDfwIclfc/PCwrr44amcmDAg8hxG0Ewe4=
+github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
+github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
+github.com/go-gl/glfw v0.0.0-20190409004039-e6da0acd62b1/go.mod h1:vR7hzQXu2zJy9AVAgeJqvqgH9Q5CA+iKCZ2gyEVpxRU=
+github.com/go-gl/glfw/v3.3/glfw v0.0.0-20191125211704-12ad95a8df72/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
github.com/go-viper/mapstructure/v2 v2.2.1 h1:ZAaOCxANMuZx5RCeg0mBdEZk7DZasvvZIxtHqx8aGss=
github.com/go-viper/mapstructure/v2 v2.2.1/go.mod h1:oJDH3BJKyqBA2TXFhDsKDGDTlndYOZ6rGS0BRZIxGhM=
+github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
+github.com/golang/groupcache v0.0.0-20190702054246-869f871628b6/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
+github.com/golang/groupcache v0.0.0-20191227052852-215e87163ea7/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
github.com/golang/groupcache v0.0.0-20241129210726-2c02b8208cf8 h1:f+oWsMOmNPc8JmEHVZIycC7hBoQxHH9pNKQORJNozsQ=
github.com/golang/groupcache v0.0.0-20241129210726-2c02b8208cf8/go.mod h1:wcDNUvekVysuuOpQKo3191zZyTpiI6se1N1ULghS0sw=
+github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
+github.com/golang/mock v1.2.0/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
+github.com/golang/mock v1.3.1/go.mod h1:sBzyDLLjw3U8JLTeZvSv8jJB+tU5PVekmnlKIyFUx0Y=
+github.com/golang/mock v1.4.0/go.mod h1:UOMv5ysSaYNkG+OFQykRIcU/QvvxJf3p21QfJ2Bt3cw=
+github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
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@@ -55,13 +128,17 @@ github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
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@@ -70,6 +147,7 @@ github.com/spf13/pflag v1.0.6/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An
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golang.org/x/net v0.0.0-20220127200216-cd36cc0744dd/go.mod h1:CfG3xpIq0wQ8r1q4Su4UZFWDARRcnwPjda9FqA0JpMk=
golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
golang.org/x/net v0.6.0/go.mod h1:2Tu9+aMcznHK/AK1HMvgo6xiTLG5rD5rZLDS+rp2Bjs=
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golang.org/x/net v0.10.0/go.mod h1:0qNGK6F8kojg2nk9dLZ2mShWaEBan6FAoqfSigmmuDg=
golang.org/x/net v0.15.0/go.mod h1:idbUs1IY1+zTqbi8yxTbhexhEEk5ur9LInksu6HrEpk=
golang.org/x/net v0.21.0/go.mod h1:bIjVDfnllIU7BJ2DNgfnXvpSvtn8VRwhlsaeUTyUS44=
@@ -117,14 +243,35 @@ golang.org/x/net v0.25.0/go.mod h1:JkAGAh7GEvH74S6FOH42FLoXpXbE/aqXSrIQjXgsiwM=
golang.org/x/net v0.33.0/go.mod h1:HXLR5J+9DxmrqMwG9qjGCxZ+zKXxBru04zlTvWlWuN4=
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golang.org/x/net v0.34.0/go.mod h1:di0qlW3YNM5oh6GqDGQr92MyTozJPmybPK4Ev/Gm31k=
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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=
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@@ -136,8 +283,8 @@ golang.org/x/sys v0.12.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.17.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
golang.org/x/sys v0.20.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
golang.org/x/sys v0.28.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
-golang.org/x/sys v0.29.0 h1:TPYlXGxvx1MGTn2GiZDhnjPA9wZzZeGKHHmKhHYvgaU=
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golang.org/x/telemetry v0.0.0-20240228155512-f48c80bd79b2/go.mod h1:TeRTkGYfJXctD9OcfyVLyj2J3IxLnKwHJR8f4D8a3YE=
golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
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@@ -147,7 +294,10 @@ golang.org/x/term v0.12.0/go.mod h1:owVbMEjm3cBLCHdkQu9b1opXd4ETQWc3BhuQGKgXgvU=
golang.org/x/term v0.17.0/go.mod h1:lLRBjIVuehSbZlaOtGMbcMncT+aqLLLmKrsjNrUguwk=
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golang.org/x/term v0.27.0/go.mod h1:iMsnZpn0cago0GOrHO2+Y7u7JPn5AylBrcoWkElMTSM=
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golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
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@@ -155,20 +305,90 @@ golang.org/x/text v0.9.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
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diff --git a/pkg/analyzer/image.go b/pkg/analyzer/image.go
new file mode 100644
index 00000000..83727ab1
--- /dev/null
+++ b/pkg/analyzer/image.go
@@ -0,0 +1,330 @@
+package analyzer
+
+import (
+ "bytes"
+ "crypto/md5"
+ "crypto/sha256"
+ "encoding/base64"
+ "encoding/binary"
+ "image"
+ "image/gif"
+ _ "image/png"
+ "io"
+ "io/fs"
+ "time"
+
+ "github.com/azr/phash"
+ "github.com/bbrks/go-blurhash"
+ "github.com/disintegration/imaging"
+ "github.com/kettek/apng"
+ "github.com/pkg/errors"
+ "github.com/readium/go-toolkit/pkg/manifest"
+ "github.com/readium/go-toolkit/pkg/mediatype"
+ "go4.org/media/heif"
+ "golang.org/x/image/riff"
+ "golang.org/x/image/webp"
+)
+
+type ImageProperties struct {
+ Size uint64
+ ModTime time.Time
+ Width uint32
+ Height uint32
+ Animated bool
+ Hashes struct {
+ Sha256 []byte
+ Md5 []byte
+ PhashDCT []byte
+ BlurHash string
+ }
+}
+
+func (p *ImageProperties) EnhanceLink(link *manifest.Link) {
+ link.Height = uint(p.Height)
+ link.Width = uint(p.Width)
+ link.Size = uint(p.Size)
+ if link.Properties == nil {
+ link.Properties = manifest.Properties{}
+ }
+
+ // TODO: more sophisticated handling of pre-existing values, conversion to dedicated struct like encryption is
+ hashes := []map[string]string{
+ {
+ "algorithm": "sha256",
+ "value": base64.StdEncoding.EncodeToString(p.Hashes.Sha256),
+ },
+ {
+ "algorithm": "md5",
+ "value": base64.StdEncoding.EncodeToString(p.Hashes.Md5),
+ },
+ }
+ if len(p.Hashes.PhashDCT) > 0 {
+ hashes = append(hashes, map[string]string{
+ "algorithm": "phash-dct",
+ "value": base64.StdEncoding.EncodeToString(p.Hashes.PhashDCT),
+ })
+ }
+ if len(p.Hashes.BlurHash) > 0 {
+ hashes = append(hashes, map[string]string{
+ "algorithm": "https://blurha.sh",
+ "value": p.Hashes.BlurHash,
+ })
+ }
+ link.Properties["hash"] = hashes
+ link.Properties["animated"] = p.Animated
+}
+
+func Image(system fs.FS, link manifest.Link, visualHash bool) (*manifest.Link, *ImageProperties, error) {
+ path := link.Href.String()
+ file, err := system.Open(path)
+ if err != nil {
+ return nil, nil, err
+ }
+ defer file.Close()
+
+ reopen := func() error {
+ if of, ok := file.(io.ReadSeeker); ok {
+ of.Seek(0, 0)
+ } else {
+ file.Close()
+ file, err = system.Open(path)
+ if err != nil {
+ return err
+ }
+ }
+ return nil
+ }
+
+ stat, err := file.Stat()
+ if err != nil {
+ return nil, nil, err
+ }
+ if stat.IsDir() {
+ return nil, nil, errors.New("must be a file, not a directory")
+ }
+
+ p := &ImageProperties{
+ Size: uint64(stat.Size()),
+ ModTime: stat.ModTime(),
+ }
+ if p.Size == 0 {
+ return nil, nil, errors.New("file is empty")
+ }
+
+ var mt *mediatype.MediaType
+ if link.MediaType != nil {
+ mt = link.MediaType
+ } else {
+ mt = mediatype.OfFileOnly(file)
+ if mt == nil {
+ return nil, nil, errors.New("file has unknown media type")
+ }
+ }
+ if !mt.IsBitmap() {
+ return nil, nil, errors.New("file is not a bitmap image")
+ }
+ // Reopen because the sniffer may have read the file
+ err = reopen()
+ if err != nil {
+ return nil, nil, errors.Wrap(err, "failed reopening file")
+ }
+
+ // Gather image width/height, and weed out unsuppored formats
+ var iconfig image.Config
+ if mt.Equal(&mediatype.AVIF) {
+ var hf *heif.File
+ if of, ok := file.(io.ReaderAt); ok {
+ hf = heif.Open(of)
+ } else {
+ // Fall back to reading the file into memory
+ buf, err := fs.ReadFile(system, path)
+ if err != nil {
+ return nil, nil, errors.Wrap(err, "failed reading AVIF file into memory")
+ }
+ hf = heif.Open(bytes.NewReader(buf))
+ }
+ pi, err := hf.PrimaryItem()
+ if err != nil {
+ return nil, nil, errors.Wrap(err, "failed decoding supposed AVIF file metadata")
+ }
+ w, h, ok := pi.VisualDimensions()
+ if !ok {
+ return nil, nil, errors.New("failed reading AVIF image dimensions")
+ }
+ iconfig.Width = w
+ iconfig.Height = h
+ } else if mt.Equal(&mediatype.JXL) {
+ magicBytes := make([]byte, 12)
+ _, err = io.ReadFull(file, magicBytes)
+ if err != nil {
+ return nil, nil, errors.Wrap(err, "failed reading JXL file for magic numbers")
+ }
+ jxlCodestream := []byte{0xFF, 0x0A}
+ jxlBmff := []byte{0x00, 0x00, 0x00, 0x0C, 0x4A, 0x58, 0x4C, 0x20, 0x0D, 0x0A, 0x87, 0x0A}
+ if !bytes.Equal(magicBytes[:2], jxlCodestream) && !bytes.Equal(magicBytes, jxlBmff) {
+ return nil, nil, errors.New("supposed JXL file is invalid")
+ }
+ return nil, nil, errors.New("JXL file format is currently unsupported")
+ } else {
+ var format string
+ iconfig, format, err = image.DecodeConfig(file)
+ if err != nil {
+ return nil, nil, errors.Wrap(err, "failed decoding image metadata")
+ }
+
+ // Special case for animated PNG which gets registered by the apng package
+ if format == "apng" {
+ if !mt.Equal(&mediatype.PNG) {
+ return nil, nil, errors.New("file mediatype not equal to decoded image format")
+ }
+ } else {
+ imt := mediatype.OfExtension(format)
+ if imt == nil {
+ return nil, nil, errors.New("failed determining mediatype from image format \"" + format + "\"")
+ }
+ if !mt.Equal(imt) {
+ return nil, nil, errors.New("file mediatype not equal to decoded image format")
+ }
+ }
+ }
+ p.Width = uint32(iconfig.Width)
+ p.Height = uint32(iconfig.Height)
+ if p.Width == 0 || p.Height == 0 {
+ return nil, nil, errors.New("image has zero width or height")
+ }
+
+ // Decoder the image so the animation can be checked, and the perceptual hash calculated
+ err = reopen()
+ if err != nil {
+ return nil, nil, errors.Wrap(err, "failed reopening file")
+ }
+ hashVisually := func(img image.Image) {
+ if !visualHash {
+ return
+ }
+ // First downsize the image because:
+ // - Phash/DCT already does this, down to 32x32px
+ // - Blurhash encoding with a large image is very slow
+ if img.Bounds().Dx() > 128 {
+ img = imaging.Resize(img, 128, 0, imaging.Lanczos)
+ }
+
+ // Create phash and put it in a byte array
+ p.Hashes.PhashDCT = make([]byte, 8)
+ binary.BigEndian.PutUint64(p.Hashes.PhashDCT, phash.DTC(img))
+
+ // Create the blurhash
+ blurhash, _ := blurhash.Encode(5, 5, img)
+ p.Hashes.BlurHash = blurhash
+ }
+ if mt.Equal(&mediatype.GIF) {
+ gi, err := gif.DecodeAll(file)
+ if err != nil {
+ return nil, nil, errors.Wrap(err, "failed decoding GIF file")
+ }
+ if len(gi.Image) > 1 {
+ p.Animated = true
+ }
+ hashVisually(gi.Image[0])
+ } else if mt.Equal(&mediatype.PNG) {
+ pi, err := apng.DecodeAll(file)
+ if err != nil {
+ return nil, nil, errors.Wrap(err, "failed decoding (A)PNG file")
+ }
+ if len(pi.Frames) > 1 {
+ p.Animated = true
+ }
+ hashVisually(pi.Frames[0].Image)
+ } else if mt.Equal(&mediatype.AVIF) {
+ // Not sure how to determine if an AVIF is animated!
+ if visualHash {
+ return nil, nil, errors.New("AVIF perceptual hash is not yet supported")
+ }
+ } else if mt.Equal(&mediatype.WEBP) {
+ var wi image.Image
+ if _, ok := file.(io.ReadSeeker); ok {
+ p.Animated, err = isWEBPAnimated(file)
+ if err != nil {
+ return nil, nil, errors.Wrap(err, "failed checking if WEBP file is animated")
+ }
+ if visualHash {
+ if p.Animated {
+ return nil, nil, errors.New("perceptual hash of animated WEBP is not yet supported")
+ }
+ err = reopen()
+ if err != nil {
+ return nil, nil, errors.Wrap(err, "failed reopening file")
+ }
+ wi, err = webp.Decode(file)
+ }
+ } else {
+ // Only read the file once into memory since we need to read it two times in a row
+ buf := make([]byte, p.Size)
+ _, err = io.ReadFull(file, buf)
+ if err != nil {
+ return nil, nil, errors.Wrap(err, "failed reading WEBP file into memory")
+ }
+ r := bytes.NewReader(buf)
+ p.Animated, err = isWEBPAnimated(r)
+ if err != nil {
+ return nil, nil, errors.Wrap(err, "failed checking if WEBP file is animated")
+ }
+ if visualHash {
+ if p.Animated {
+ return nil, nil, errors.New("perceptual hash of animated WEBP is not yet supported")
+ }
+ r.Seek(0, 0)
+ wi, err = webp.Decode(r)
+ }
+ }
+ if err != nil {
+ return nil, nil, errors.Wrap(err, "failed decoding WEBP file")
+ }
+ if visualHash {
+ hashVisually(wi)
+ }
+ } else if visualHash {
+ // Any other format can be generically decoded since it doesn't support animation
+ img, _, err := image.Decode(file)
+ if err != nil {
+ return nil, nil, errors.Wrap(err, "failed decoding image file")
+ }
+ hashVisually(img)
+ }
+
+ // Now compute the cryptographic hashes
+ err = reopen()
+ if err != nil {
+ return nil, nil, errors.Wrap(err, "failed reopening file")
+ }
+ s2hash := sha256.New()
+ mdhash := md5.New()
+ mw := io.MultiWriter(s2hash, mdhash)
+ if _, err := io.Copy(mw, file); err != nil {
+ panic(err)
+ }
+ p.Hashes.Sha256 = s2hash.Sum(nil)
+ p.Hashes.Md5 = mdhash.Sum(nil)
+
+ p.EnhanceLink(&link)
+ return &link, p, nil
+}
+
+func isWEBPAnimated(file io.Reader) (bool, error) {
+ _, data, err := riff.NewReader(file)
+ if err != nil {
+ return false, errors.Wrap(err, "failed reading RIFF data from WEBP file")
+ }
+ id, _, _, err := data.Next()
+ var frames uint32
+ for err == nil {
+ if id == riff.FourCC([4]byte{'A', 'N', 'M', 'F'}) {
+ frames++
+ }
+ id, _, _, err = data.Next()
+ }
+ if err != io.EOF {
+ return false, errors.Wrap(err, "failed reading RIFF chunks from WEBP file")
+ }
+ return frames > 1, nil
+}