mirror of
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56 lines
1.6 KiB
Go
56 lines
1.6 KiB
Go
/*
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* Copyright 2017-2019 Kopano and its licensors
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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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*
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*/
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package identifier
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import (
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"encoding/base64"
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"fmt"
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"net/http"
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"strings"
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"time"
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"github.com/gabriel-vasile/mimetype"
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)
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var (
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farPastExpiryTime = time.Unix(0, 0)
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farPastExpiryTimeHTTPHeaderString = farPastExpiryTime.UTC().Format(http.TimeFormat)
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)
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func addCommonResponseHeaders(header http.Header) {
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header.Set("X-Frame-Options", "DENY")
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header.Set("X-XSS-Protection", "1; mode=block")
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header.Set("X-Content-Type-Options", "nosniff")
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header.Set("Referrer-Policy", "origin")
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}
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func addNoCacheResponseHeaders(header http.Header) {
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header.Set("Cache-Control", "no-cache, no-store, must-revalidate")
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header.Set("Pragma", "no-cache")
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header.Set("Expires", farPastExpiryTimeHTTPHeaderString)
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}
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func encodeImageAsDataURL(b []byte) (string, error) {
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mt := mimetype.Detect(b)
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if !strings.HasPrefix(mt.String(), "image/") {
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return "", fmt.Errorf("not an image: %s", mt)
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}
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return "data:" + mt.String() + ";base64," + base64.StdEncoding.EncodeToString(b), nil
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}
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