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parser.go
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/
parser.go
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/*
* BSD 3-Clause License
*
* Copyright (c) 2023. Edgar Schmidt
*
* Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
* following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this list of conditions and the following
* disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided with the distribution.
*
* Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package howlongtobeat
import (
"bufio"
"bytes"
"encoding/json"
"errors"
"fmt"
"io"
"net/http"
)
type parseResponseFunc func(resp *http.Response) error
// jsonParser returns a function that will decode the body of an http.Response as JSON into the provided struct.
func (c *Client) jsonParser(val any) parseResponseFunc {
return func(resp *http.Response) error {
return json.NewDecoder(resp.Body).Decode(val)
}
}
// Deprecated: Use nextDataParser instead
func (c *Client) htmlScriptDataParserByID(val any, ID string) parseResponseFunc {
return func(resp *http.Response) error {
startTag := []byte(fmt.Sprintf(`<script id="%s" type="application/json">`, ID))
endTag := []byte(`</script>`)
scanner := bufio.NewScanner(resp.Body)
scanner.Split(bufio.ScanLines)
var data []byte
startTagFound := false
for scanner.Scan() {
line := scanner.Bytes()
if !startTagFound {
startIndex := bytes.Index(line, startTag)
if startIndex != -1 {
startTagFound = true
// Adjust line to start at the beginning of JSON content, not at the start tag
line = line[startIndex+len(startTag):]
}
}
if startTagFound {
endIndex := bytes.Index(line, endTag)
if endIndex != -1 {
// Adjust line to end at the beginning of the end tag, not include the end tag
line = line[:endIndex]
}
data = append(data, line...)
if endIndex != -1 {
break
}
}
}
if err := scanner.Err(); err != nil {
return err
}
if !startTagFound {
return errors.New("start tag not found")
}
return json.Unmarshal(data, &val)
}
}
func (c *Client) nextDataParser(val any) parseResponseFunc {
return func(resp *http.Response) error {
startTag := []byte(`<script id="__NEXT_DATA__" type="application/json">`)
endTag := []byte(`</script>`)
body, err := io.ReadAll(resp.Body)
if err != nil {
return err
}
start := bytes.Index(body, startTag)
end := bytes.Index(body[start:], endTag)
return json.Unmarshal(body[start+len(startTag):start+end], &val)
}
}