commit 161abc96c84211c52dd4918b0c8a2396315d2093
Author: Knut Ahlers <knut@ahlers.me>
Date:   Fri Aug 16 23:00:10 2019 +0200

    Initial version

diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..b95fd4c
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,14 @@
+module github.com/Luzifer/sri
+
+go 1.12
+
+require (
+	github.com/Luzifer/rconfig/v2 v2.2.1
+	github.com/konsorten/go-windows-terminal-sequences v1.0.2 // indirect
+	github.com/pkg/errors v0.8.1
+	github.com/sirupsen/logrus v1.4.2
+	github.com/stretchr/objx v0.2.0 // indirect
+	github.com/stretchr/testify v1.4.0 // indirect
+	golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a // indirect
+	gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..7265960
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,28 @@
+github.com/Luzifer/rconfig/v2 v2.2.1 h1:zcDdLQlnlzwcBJ8E0WFzOkQE1pCMn3EbX0dFYkeTczg=
+github.com/Luzifer/rconfig/v2 v2.2.1/go.mod h1:OKIX0/JRZrPJ/ZXXWklQEFXA6tBfWaljZbW37w+sqBw=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
+github.com/konsorten/go-windows-terminal-sequences v1.0.2/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
+github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
+github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/sirupsen/logrus v1.4.2 h1:SPIRibHv4MatM3XXNO2BJeFLZwZ2LvZgfQ5+UNI2im4=
+github.com/sirupsen/logrus v1.4.2/go.mod h1:tLMulIdttU9McNUspp0xgXVQah82FyeX6MwdIuYE2rE=
+github.com/spf13/pflag v1.0.3 h1:zPAT6CGy6wXeQ7NtTnaTerfKOsV6V6F8agHXFiazDkg=
+github.com/spf13/pflag v1.0.3/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/objx v0.2.0/go.mod h1:qt09Ya8vawLte6SNmTgCsAVtYtaKzEcn8ATUoHMkEqE=
+github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
+github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
+github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
+golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a h1:aYOabOQFp6Vj6W1F80affTUvO9UxmJRx8K0gsfABByQ=
+golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/validator.v2 v2.0.0-20180514200540-135c24b11c19 h1:WB265cn5OpO+hK3pikC9hpP1zI/KTwmyMFKloW9eOVc=
+gopkg.in/validator.v2 v2.0.0-20180514200540-135c24b11c19/go.mod h1:o4V0GXN9/CAmCsvJ0oXYZvrZOe7syiDZSN1GWGZTGzc=
+gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..8551714
--- /dev/null
+++ b/main.go
@@ -0,0 +1,85 @@
+package main
+
+import (
+	"crypto/sha512"
+	"encoding/base64"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"os"
+
+	"github.com/pkg/errors"
+	log "github.com/sirupsen/logrus"
+
+	"github.com/Luzifer/rconfig/v2"
+)
+
+var (
+	cfg = struct {
+		HTML           bool   `flag:"html" default:"true" description:"Print HTML tags with SRI information (If disabled just prints the hashes)"`
+		HTMLTag        string `flag:"html-tag" default:"link" description:"Tag to use for HTML mode (supported: link, script)"`
+		LogLevel       string `flag:"log-level" default:"info" description:"Log level (debug, info, warn, error, fatal)"`
+		VersionAndExit bool   `flag:"version" default:"false" description:"Prints current version and exits"`
+	}{}
+
+	htmlTemplate = map[string]string{
+		"link":   `<link href=%q integrity=%q crossorigin="anonymous">`,
+		"script": `<script src=%q integrity=%q></script>`,
+	}
+
+	version = "dev"
+)
+
+func init() {
+	if err := rconfig.ParseAndValidate(&cfg); err != nil {
+		log.Fatalf("Unable to parse commandline options: %s", err)
+	}
+
+	if cfg.VersionAndExit {
+		fmt.Printf("sri %s\n", version)
+		os.Exit(0)
+	}
+
+	if l, err := log.ParseLevel(cfg.LogLevel); err != nil {
+		log.WithError(err).Fatal("Unable to parse log level")
+	} else {
+		log.SetLevel(l)
+	}
+}
+
+func main() {
+	for _, url := range rconfig.Args()[1:] {
+		logger := log.WithField("url", url)
+		logger.Debug("Fetching SRI...")
+
+		hash, err := sriIntegrity(url)
+		if err != nil {
+			logger.WithError(err).Error("Unable to fetch SRI hash")
+			continue
+		}
+
+		if cfg.HTML {
+			fmt.Printf(htmlTemplate[cfg.HTMLTag], url, hash)
+			fmt.Println()
+			continue
+		}
+
+		fmt.Printf("%s\t%s\n", url, hash)
+	}
+}
+
+func sriIntegrity(url string) (string, error) {
+	resp, err := http.Get(url)
+	if err != nil {
+		return "", errors.Wrap(err, "Unable to get URL contents")
+	}
+	defer resp.Body.Close()
+
+	payload, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return "", errors.Wrap(err, "Unable to read body")
+	}
+
+	hash := sha512.Sum512(payload)
+	return "sha512-" + base64.StdEncoding.EncodeToString(hash[:]), nil
+}