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Merge pull request #15 from placeholder-app/amattu2/issue14
#14 Add E-Tag Header Support
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,66 @@ | ||
| /* | ||
| * Produced: Wed Feb 08 2023 | ||
| * Author: Alec M. | ||
| * GitHub: https://amattu.com/links/github | ||
| * Copyright: (C) 2023 Alec M. | ||
| * License: License GNU Affero General Public License v3.0 | ||
| * | ||
| * This program is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU Affero General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU Affero General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU Affero General Public License | ||
| * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
| */ | ||
|
|
||
| package middlewares | ||
|
|
||
| import ( | ||
| "net/http" | ||
| "placeholder-app/backend/shared" | ||
|
|
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| "github.com/gin-gonic/gin" | ||
| ) | ||
|
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| // GenerateEtag generates an ETag based on the query string | ||
| // | ||
| // c: gin context to generate ETag from | ||
| func generateEtag(c *gin.Context) string { | ||
| from := []string{ | ||
| c.Param("size"), | ||
| c.Param("bgColor"), | ||
| c.Param("txtColor"), | ||
| c.Query("text"), | ||
| c.Query("borderWidth"), | ||
| c.Query("borderColor"), | ||
| c.Query("font"), | ||
| c.Query("format"), | ||
| } | ||
| str := "" | ||
|
|
||
| for _, v := range from { | ||
| str += v | ||
| } | ||
|
|
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| return shared.GenerateHash(str) | ||
| } | ||
|
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| func ETag() gin.HandlerFunc { | ||
| return func(c *gin.Context) { | ||
| var sum = generateEtag(c) | ||
|
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| if c.Request.Header.Get("If-None-Match") == sum { | ||
| c.AbortWithStatus(http.StatusNotModified) | ||
| } | ||
|
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| c.Writer.Header().Set("ETag", sum) | ||
|
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| c.Next() | ||
| } | ||
| } |
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