51 lines
1.2 KiB
Go
51 lines
1.2 KiB
Go
package controllers
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import (
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"context"
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"crypto/hmac"
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"crypto/sha256"
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"encoding/hex"
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"io"
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"git.preston-baxter.com/Preston_PLB/capstone/frontend-service/config"
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"git.preston-baxter.com/Preston_PLB/capstone/frontend-service/db/models"
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"github.com/gin-gonic/gin"
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)
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const PCO_VALIDATE_HEADER = "X-PCO-Webhooks-Authenticity"
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func ValidatePcoWebhook(c *gin.Context) {
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conf := config.Config()
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//get remote version from header
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remoteDigestStr := c.GetHeader(PCO_VALIDATE_HEADER)
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if remoteDigestStr == "" {
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log.Warnf("Request was sent with no %s header. Rejecting", PCO_VALIDATE_HEADER)
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c.AbortWithStatus(401)
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return
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}
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pcoSig := make([]byte, len(remoteDigestStr)/2)
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_, err := hex.Decode(pcoSig, []byte(remoteDigestStr))
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//clone request to harmlessly inspect the body
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bodyReader := c.Request.Clone(context.Background()).Body
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body, err := io.ReadAll(bodyReader)
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if err != nil {
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log.WithError(err).Error("Failed to read body while validating PCO webhook")
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c.AbortWithError(501, err)
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return
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}
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//Get secret
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key := conf.Vendors[models.PCO_VENDOR_NAME].WebhookSecret
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//Get HMAC
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hmacSig := hmac.New(sha256.New, []byte(key))
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hmacSig.Write(body)
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if !hmac.Equal(hmacSig.Sum(nil), pcoSig) {
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log.Warn("")
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c.AbortWithStatus(401)
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}
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}
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