mirror of https://github.com/status-im/op-geth.git
140 lines
3.2 KiB
Go
140 lines
3.2 KiB
Go
// Copyright 2014 The go-ethereum Authors
|
|
// This file is part of the go-ethereum library.
|
|
//
|
|
// The go-ethereum library is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Lesser General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// The go-ethereum library is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU Lesser General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Lesser General Public License
|
|
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package common
|
|
|
|
import (
|
|
"archive/zip"
|
|
"encoding/json"
|
|
"fmt"
|
|
"io"
|
|
"io/ioutil"
|
|
"strings"
|
|
)
|
|
|
|
// Manifest object
|
|
//
|
|
// The manifest object holds all the relevant information supplied with the
|
|
// the manifest specified in the package
|
|
type Manifest struct {
|
|
Entry string
|
|
Height, Width int
|
|
}
|
|
|
|
// External package
|
|
//
|
|
// External package contains the main html file and manifest
|
|
type ExtPackage struct {
|
|
EntryHtml string
|
|
Manifest *Manifest
|
|
}
|
|
|
|
// Read file
|
|
//
|
|
// Read a given compressed file and returns the read bytes.
|
|
// Returns an error otherwise
|
|
func ReadFile(f *zip.File) ([]byte, error) {
|
|
rc, err := f.Open()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
defer rc.Close()
|
|
|
|
content, err := ioutil.ReadAll(rc)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return content, nil
|
|
}
|
|
|
|
// Reads manifest
|
|
//
|
|
// Reads and returns a manifest object. Returns error otherwise
|
|
func ReadManifest(m []byte) (*Manifest, error) {
|
|
var manifest Manifest
|
|
|
|
dec := json.NewDecoder(strings.NewReader(string(m)))
|
|
if err := dec.Decode(&manifest); err == io.EOF {
|
|
} else if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return &manifest, nil
|
|
}
|
|
|
|
// Find file in archive
|
|
//
|
|
// Returns the index of the given file name if it exists. -1 if file not found
|
|
func FindFileInArchive(fn string, files []*zip.File) (index int) {
|
|
index = -1
|
|
// Find the manifest first
|
|
for i, f := range files {
|
|
if f.Name == fn {
|
|
index = i
|
|
}
|
|
}
|
|
|
|
return
|
|
}
|
|
|
|
// Open package
|
|
//
|
|
// Opens a prepared ethereum package
|
|
// Reads the manifest file and determines file contents and returns and
|
|
// the external package.
|
|
func OpenPackage(fn string) (*ExtPackage, error) {
|
|
r, err := zip.OpenReader(fn)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
defer r.Close()
|
|
|
|
manifestIndex := FindFileInArchive("manifest.json", r.File)
|
|
|
|
if manifestIndex < 0 {
|
|
return nil, fmt.Errorf("No manifest file found in archive")
|
|
}
|
|
|
|
f, err := ReadFile(r.File[manifestIndex])
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
manifest, err := ReadManifest(f)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if manifest.Entry == "" {
|
|
return nil, fmt.Errorf("Entry file specified but appears to be empty: %s", manifest.Entry)
|
|
}
|
|
|
|
entryIndex := FindFileInArchive(manifest.Entry, r.File)
|
|
if entryIndex < 0 {
|
|
return nil, fmt.Errorf("Entry file not found: '%s'", manifest.Entry)
|
|
}
|
|
|
|
f, err = ReadFile(r.File[entryIndex])
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
extPackage := &ExtPackage{string(f), manifest}
|
|
|
|
return extPackage, nil
|
|
}
|