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authorNick White <git@njw.name>2022-02-21 14:54:42 +0000
committerNick White <git@njw.name>2022-02-21 14:54:42 +0000
commit2c29e91bd98a1354d0cc4772ca629e3f1fc327b5 (patch)
tree12117de3210c795a4d407fb277f640221e327466 /cmd/rescribe/gbook.go
parent69ac99da02988ad2ed675570ccaa5ff7777f0279 (diff)
rescribe: Add getgbook use to the GUI (not embedded yet)
Diffstat (limited to 'cmd/rescribe/gbook.go')
-rw-r--r--cmd/rescribe/gbook.go209
1 files changed, 209 insertions, 0 deletions
diff --git a/cmd/rescribe/gbook.go b/cmd/rescribe/gbook.go
new file mode 100644
index 0000000..b1308cf
--- /dev/null
+++ b/cmd/rescribe/gbook.go
@@ -0,0 +1,209 @@
+// Copyright 2022 Nick White.
+// Use of this source code is governed by the GPLv3
+// license that can be found in the LICENSE file.
+
+package main
+
+import (
+ "context"
+ "encoding/json"
+ "fmt"
+ "io"
+ "io/ioutil"
+ "net/http"
+ "os"
+ "os/exec"
+ "path"
+ "strings"
+ "unicode"
+
+ "rescribe.xyz/bookpipeline/internal/pipeline"
+)
+
+const maxPartLength = 48
+
+// formatAuthors formats a list of authors by just selecting
+// the first one listed, and returning the uppercased final
+// name.
+func formatAuthors(authors []string) string {
+ if len(authors) == 0 {
+ return ""
+ }
+
+ s := authors[0]
+
+ parts := strings.Fields(s)
+ if len(parts) > 1 {
+ s = parts[len(parts)-1]
+ }
+
+ s = strings.ToUpper(s)
+
+ if len(s) > maxPartLength {
+ s = s[:maxPartLength]
+ }
+
+ s = strings.Map(stripNonLetters, s)
+
+ return s
+}
+
+// mapTitle is a function for strings.Map to strip out
+// unwanted characters from the title.
+func stripNonLetters(r rune) rune {
+ if !unicode.IsLetter(r) {
+ return -1
+ }
+ return r
+}
+
+// formatTitle formats a title to our preferences, notably
+// by stripping spaces and punctuation characters.
+func formatTitle(title string) string {
+ s := strings.Map(stripNonLetters, title)
+ if len(s) > maxPartLength {
+ s = s[:maxPartLength]
+ }
+ return s
+}
+
+// getMetadata queries Google Books for metadata we care about
+// and returns it formatted as we need it.
+func getMetadata(id string) (string, string, string, error) {
+ var author, title, year string
+ url := fmt.Sprintf("https://www.googleapis.com/books/v1/volumes/%s", id)
+
+ // designed to be unmarshalled by encoding/json's Unmarshal()
+ type bookInfo struct {
+ VolumeInfo struct {
+ Title string
+ Authors []string
+ PublishedDate string
+ }
+ }
+
+ resp, err := http.Get(url)
+ if err != nil {
+ return author, title, year, fmt.Errorf("Error downloading metadata %s: %v", url, err)
+ }
+ defer resp.Body.Close()
+
+ if resp.StatusCode != http.StatusOK {
+ return author, title, year, fmt.Errorf("Error downloading metadata %s: %v", url, err)
+ }
+
+ b, err := ioutil.ReadAll(resp.Body)
+ if err != nil {
+ return author, title, year, fmt.Errorf("Error reading metadata %s: %v", url, err)
+ }
+
+ v := bookInfo{}
+ err = json.Unmarshal(b, &v)
+ if err != nil {
+ return author, title, year, fmt.Errorf("Error parsing metadata %s: %v", url, err)
+ }
+
+ author = formatAuthors(v.VolumeInfo.Authors)
+ title = formatTitle(v.VolumeInfo.Title)
+ year = v.VolumeInfo.PublishedDate
+
+ return author, title, year, nil
+}
+
+// moveFile just copies a file to the destination without
+// using os.Rename, as that can fail if crossing filesystem
+// boundaries
+func moveFile(from string, to string) error {
+ ffrom, err := os.Open(from)
+ if err != nil {
+ return err
+ }
+ defer ffrom.Close()
+
+ fto, err := os.Create(to)
+ if err != nil {
+ return err
+ }
+ defer fto.Close()
+
+ _, err = io.Copy(fto, ffrom)
+ if err != nil {
+ return err
+ }
+
+ ffrom.Close()
+ err = os.Remove(from)
+ if err != nil {
+ return err
+ }
+
+ return nil
+}
+
+// getGoogleBook downloads all images of a book to a directory
+// named YEAR_AUTHORSURNAME_Title_bookid inside basedir, returning
+// the directory path
+func getGoogleBook(ctx context.Context, id string, basedir string) (string, error) {
+ author, title, year, err := getMetadata(id)
+ if err != nil {
+ return "", err
+ }
+
+ tmpdir, err := ioutil.TempDir("", "bookpipeline")
+ if err != nil {
+ return "", fmt.Errorf("Error setting up temporary directory: %v", err)
+ }
+
+ // TODO: use embedded version if necessary
+ cmd := exec.CommandContext(ctx, "getgbook", id)
+ pipeline.HideCmd(cmd)
+ cmd.Dir = tmpdir
+ cmd.Stdout = os.Stdout
+ cmd.Stderr = os.Stderr
+ err = cmd.Run()
+ if err != nil {
+ return "", fmt.Errorf("Error running getgbook %s: %v", id, err)
+ }
+
+ select {
+ case <-ctx.Done():
+ _ = os.Remove(tmpdir)
+ return "", ctx.Err()
+ default:
+ }
+
+ // getgbook downloads into id directory, so move files out of
+ // there directly into dir
+ tmpdir = path.Join(tmpdir, id)
+ f, err := os.Open(tmpdir)
+ if err != nil {
+ return "", fmt.Errorf("Failed to open %s to move files: %v", tmpdir, err)
+ }
+ files, err := f.Readdir(0)
+ if err != nil {
+ return "", fmt.Errorf("Failed to readdir %s to move files: %v", tmpdir, err)
+ }
+
+ d := fmt.Sprintf("%s_%s_%s_%s", year, author, title, id)
+ dir := path.Join(basedir, d)
+ err = os.MkdirAll(dir, 0755)
+ if err != nil {
+ return "", fmt.Errorf("Couldn't create directory %s: %v", dir, err)
+ }
+
+ for _, v := range files {
+ orig := path.Join(tmpdir, v.Name())
+ new := path.Join(dir, v.Name())
+ err = moveFile(orig, new)
+ if err != nil {
+ return dir, fmt.Errorf("Failed to move %s to %s: %v", orig, new, err)
+ }
+ }
+
+ err = os.Remove(tmpdir)
+ if err != nil {
+ return dir, fmt.Errorf("Failed to remove temporary directory %s: %v", tmpdir, err)
+ }
+
+ return dir, nil
+}