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51 lines
1.4 KiB
51 lines
1.4 KiB
/*
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Copyright The Helm Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package installer
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import "net/http"
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// isGzipArchive checks if data represents a gzip archive by checking the magic bytes
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func isGzipArchive(data []byte) bool {
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return len(data) >= 2 && data[0] == 0x1f && data[1] == 0x8b
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}
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// isGzipArchiveFromURL checks if a URL points to a gzip archive by reading the magic bytes
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func isGzipArchiveFromURL(url string) bool {
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// Make a GET request to read the first few bytes
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req, err := http.NewRequest(http.MethodGet, url, nil)
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if err != nil {
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return false
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}
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// Request only the first 512 bytes to check magic bytes
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req.Header.Set("Range", "bytes=0-511")
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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return false
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}
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defer resp.Body.Close()
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// Read the first few bytes
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buf := make([]byte, 2)
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n, err := resp.Body.Read(buf)
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if err != nil || n < 2 {
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return false
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}
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return isGzipArchive(buf)
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}
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