119 lines
2.8 KiB
Go
119 lines
2.8 KiB
Go
// SPDX-FileCopyrightText: Copyright The Miniflux Authors. All rights reserved.
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// SPDX-License-Identifier: Apache-2.0
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package client // import "miniflux.app/v2/internal/http/client"
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import (
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"bytes"
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"fmt"
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"io"
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"regexp"
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"strings"
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"unicode/utf8"
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"golang.org/x/net/html/charset"
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)
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var xmlEncodingRegex = regexp.MustCompile(`<\?xml(.*)encoding=["'](.+)["'](.*)\?>`)
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// Response wraps a server response.
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type Response struct {
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Body io.Reader
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StatusCode int
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EffectiveURL string
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LastModified string
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ETag string
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Expires string
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ContentType string
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ContentLength int64
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}
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func (r *Response) String() string {
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return fmt.Sprintf(
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`StatusCode=%d EffectiveURL=%q LastModified=%q ETag=%s Expires=%s ContentType=%q ContentLength=%d`,
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r.StatusCode,
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r.EffectiveURL,
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r.LastModified,
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r.ETag,
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r.Expires,
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r.ContentType,
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r.ContentLength,
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)
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}
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// IsNotFound returns true if the resource doesn't exist anymore.
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func (r *Response) IsNotFound() bool {
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return r.StatusCode == 404 || r.StatusCode == 410
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}
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// IsNotAuthorized returns true if the resource require authentication.
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func (r *Response) IsNotAuthorized() bool {
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return r.StatusCode == 401
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}
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// HasServerFailure returns true if the status code represents a failure.
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func (r *Response) HasServerFailure() bool {
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return r.StatusCode >= 400
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}
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// IsModified returns true if the resource has been modified.
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func (r *Response) IsModified(etag, lastModified string) bool {
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if r.StatusCode == 304 {
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return false
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}
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if r.ETag != "" && r.ETag == etag {
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return false
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}
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if r.LastModified != "" && r.LastModified == lastModified {
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return false
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}
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return true
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}
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// EnsureUnicodeBody makes sure the body is encoded in UTF-8.
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//
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// If a charset other than UTF-8 is detected, we convert the document to UTF-8.
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// This is used by the scraper and feed readers.
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//
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// Do not forget edge cases:
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//
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// - Feeds with encoding specified only in Content-Type header and not in XML document
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// - Feeds with encoding specified in both places
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// - Feeds with encoding specified only in XML document and not in HTTP header
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// - Feeds with wrong encoding defined and already in UTF-8
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func (r *Response) EnsureUnicodeBody() (err error) {
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buffer, err := io.ReadAll(r.Body)
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if err != nil {
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return err
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}
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r.Body = bytes.NewReader(buffer)
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if utf8.Valid(buffer) {
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return nil
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}
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if strings.Contains(r.ContentType, "xml") {
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// We ignore documents with encoding specified in XML prolog.
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// This is going to be handled by the XML parser.
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length := 1024
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if len(buffer) < 1024 {
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length = len(buffer)
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}
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if xmlEncodingRegex.Match(buffer[0:length]) {
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return nil
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}
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}
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r.Body, err = charset.NewReader(r.Body, r.ContentType)
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return err
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}
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// BodyAsString returns the response body as string.
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func (r *Response) BodyAsString() string {
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bytes, _ := io.ReadAll(r.Body)
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return string(bytes)
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}
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