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123 lines
3.7 KiB
123 lines
3.7 KiB
// Copyright 2015 clair authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package detectors exposes functions to register and use container
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// information extractors.
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package detectors
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import (
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"fmt"
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"io"
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"math"
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"net/http"
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"os"
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"strings"
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"sync"
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cerrors "github.com/coreos/clair/utils/errors"
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"github.com/coreos/pkg/capnslog"
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)
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// The DataDetector interface defines a way to detect the required data from input path
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type DataDetector interface {
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//Support check if the input path and format are supported by the underling detector
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Supported(path string, format string) bool
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// Detect detects the required data from input path
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Detect(layerReader io.ReadCloser, toExtract []string, maxFileSize int64) (data map[string][]byte, err error)
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}
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var (
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dataDetectorsLock sync.Mutex
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dataDetectors = make(map[string]DataDetector)
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log = capnslog.NewPackageLogger("github.com/coreos/clair", "detectors")
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// ErrCouldNotFindLayer is returned when we could not download or open the layer file.
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ErrCouldNotFindLayer = cerrors.NewBadRequestError("could not find layer")
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)
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// RegisterDataDetector provides a way to dynamically register an implementation of a
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// DataDetector.
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//
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// If RegisterDataDetector is called twice with the same name if DataDetector is nil,
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// or if the name is blank, it panics.
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func RegisterDataDetector(name string, f DataDetector) {
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if name == "" {
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panic("Could not register a DataDetector with an empty name")
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}
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if f == nil {
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panic("Could not register a nil DataDetector")
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}
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dataDetectorsLock.Lock()
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defer dataDetectorsLock.Unlock()
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if _, alreadyExists := dataDetectors[name]; alreadyExists {
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panic(fmt.Sprintf("Detector '%s' is already registered", name))
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}
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dataDetectors[name] = f
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}
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// DetectData finds the Data of the layer by using every registered DataDetector
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func DetectData(format, path string, headers map[string]string, toExtract []string, maxFileSize int64) (data map[string][]byte, err error) {
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var layerReader io.ReadCloser
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if strings.HasPrefix(path, "http://") || strings.HasPrefix(path, "https://") {
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// Create a new HTTP request object.
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request, err := http.NewRequest("GET", path, nil)
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if err != nil {
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return nil, ErrCouldNotFindLayer
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}
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// Set any provided HTTP Headers.
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if headers != nil {
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for k, v := range headers {
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request.Header.Set(k, v)
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}
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}
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// Send the request and handle the response.
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r, err := http.DefaultClient.Do(request)
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if err != nil {
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log.Warningf("could not download layer: %s", err)
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return nil, ErrCouldNotFindLayer
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}
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// Fail if we don't receive a 2xx HTTP status code.
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if math.Floor(float64(r.StatusCode/100)) != 2 {
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log.Warningf("could not download layer: got status code %d, expected 2XX", r.StatusCode)
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return nil, ErrCouldNotFindLayer
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}
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layerReader = r.Body
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} else {
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layerReader, err = os.Open(path)
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if err != nil {
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return nil, ErrCouldNotFindLayer
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}
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}
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defer layerReader.Close()
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for _, detector := range dataDetectors {
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if detector.Supported(path, format) {
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data, err = detector.Detect(layerReader, toExtract, maxFileSize)
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if err != nil {
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return nil, err
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}
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return data, nil
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}
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}
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return nil, cerrors.NewBadRequestError(fmt.Sprintf("unsupported image format '%s'", format))
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}
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