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main.go
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main.go
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// Freeze file containing urls along with the content of all urls. Frozen file
// will be a zip file, containing something like:
//
// /blob
// /mapping.json
// /files/<sha1 of url>
// /files/<sha1 of url>
// /files/...
//
// $ curl -s https://queue.acm.org/ | span-freeze -b -o acm.zip
package main
import (
"archive/zip"
"crypto/sha1"
"flag"
"fmt"
"io"
"io/ioutil"
"net/http"
"os"
"strings"
"time"
"github.com/segmentio/encoding/json"
"github.com/dchest/safefile"
log "github.com/sirupsen/logrus"
"github.com/miku/span"
"mvdan.cc/xurls"
)
const (
NameBlob = "blob"
NameMapping = "mapping.json"
NameDir = "files"
)
var (
output = flag.String("o", "", "output file")
bestEffort = flag.Bool("b", false, "report errors but do not stop")
showVersion = flag.Bool("v", false, "prints current program version")
)
func main() {
flag.Parse()
if *showVersion {
fmt.Println(span.AppVersion)
os.Exit(0)
}
if *output == "" {
log.Fatal("output file required")
}
file, err := safefile.Create(*output, 0644)
if err != nil {
log.Fatal(err)
}
defer file.Close()
w := zip.NewWriter(file)
comment := fmt.Sprintf(`Freeze-Date: %s`, time.Now().Format(time.RFC3339))
if err := w.SetComment(comment); err != nil {
log.Fatal(err)
}
b, err := ioutil.ReadAll(os.Stdin)
if err != nil {
log.Fatal(err)
}
f, err := w.Create(NameBlob)
if err != nil {
log.Fatal(err)
}
if _, err := f.Write(b); err != nil {
log.Fatal(err)
}
var (
urls = xurls.Strict.FindAllString(string(b), -1)
seen = make(map[string]bool)
unique []string
)
for _, u := range urls {
u = strings.TrimSpace(u)
if _, ok := seen[u]; !ok {
unique = append(unique, u)
seen[u] = true
}
}
// Not necessary, but keep an additional mapping to simplify reading later.
mapping := make(map[string]string)
for i, u := range unique {
if !strings.HasPrefix(u, "http") {
log.Printf("skip: %s", u)
continue
}
h := sha1.New()
h.Write([]byte(u))
name := fmt.Sprintf("%s/%x", NameDir, h.Sum(nil))
mapping[u] = name
resp, err := http.Get(u)
if err != nil || resp.StatusCode >= 400 {
if *bestEffort {
log.Printf("[%04d %s] %v", i, u, err)
continue
} else {
log.Fatalf("failed to fetch resource (%d): err", resp.StatusCode)
}
}
defer resp.Body.Close()
f, err := w.Create(name)
if err != nil {
log.Fatal(err)
}
if _, err := io.Copy(f, resp.Body); err != nil {
log.Fatal(err)
}
log.Printf("[%04d %s] %s", i, name, u)
}
f, err = w.Create(NameMapping)
if err != nil {
log.Fatal(err)
}
if err := json.NewEncoder(f).Encode(mapping); err != nil {
log.Fatal(err)
}
if err := w.Close(); err != nil {
log.Fatal(err)
}
if err := file.Commit(); err != nil {
log.Fatal(err)
}
}