From 1a07bbe0475b3a5a9e0db79bd0c7a8fdcfa643dd Mon Sep 17 00:00:00 2001
From: Jan-Lukas Else <mail@jlelse.de>
Date: Tue, 3 Dec 2019 18:12:10 +0100
Subject: [PATCH] Automated Webmentions sending

---
 go.mod        |  5 ++++-
 go.sum        | 14 ++++++++++++--
 main.go       |  5 +++++
 webmention.go | 31 +++++++++++++++++++++++++++++++
 4 files changed, 52 insertions(+), 3 deletions(-)
 create mode 100644 webmention.go

diff --git a/go.mod b/go.mod
index 9c0be5a..e015d45 100644
--- a/go.mod
+++ b/go.mod
@@ -2,4 +2,7 @@ module codeberg.org/jlelse/hugo-micropub
 
 go 1.13
 
-require gopkg.in/yaml.v2 v2.2.5
+require (
+	gopkg.in/yaml.v2 v2.2.7
+	willnorris.com/go/webmention v0.0.0-20191104072158-c7fb13569b62 // indirect
+)
diff --git a/go.sum b/go.sum
index 9f20a70..8875ab7 100644
--- a/go.sum
+++ b/go.sum
@@ -1,3 +1,13 @@
+github.com/andybalholm/cascadia v1.0.0 h1:hOCXnnZ5A+3eVDX8pvgl4kofXv2ELss0bKcqRySc45o=
+github.com/andybalholm/cascadia v1.0.0/go.mod h1:GsXiBklL0woXo1j/WYWtSYYC4ouU9PqHO0sqidkEA4Y=
+github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
+github.com/wsxiaoys/terminal v0.0.0-20160513160801-0940f3fc43a0/go.mod h1:IXCdmsXIht47RaVFLEdVnh1t+pgYtTAhQGj73kz+2DM=
+golang.org/x/net v0.0.0-20180218175443-cbe0f9307d01/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
+golang.org/x/net v0.0.0-20180911220305-26e67e76b6c3 h1:czFLhve3vsQetD6JOJ8NZZvGQIXlnN3/yXxbT6/awxI=
+golang.org/x/net v0.0.0-20180911220305-26e67e76b6c3/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v2 v2.2.5 h1:ymVxjfMaHvXD8RqPRmzHHsB3VvucivSkIAvJFDI5O3c=
-gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.7 h1:VUgggvou5XRW9mHwD/yXxIYSMtY0zoKQf/v226p2nyo=
+gopkg.in/yaml.v2 v2.2.7/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+willnorris.com/go/webmention v0.0.0-20191104072158-c7fb13569b62 h1:jqC8A1S2/9WjXSOK/Nl2rYwVgxU7DCnZ/zpOTL1BErI=
+willnorris.com/go/webmention v0.0.0-20191104072158-c7fb13569b62/go.mod h1:p+ZRAsZS2pzZ6kX3GKWYurf3WZI2ygj7VbR8NM8qwfM=
diff --git a/main.go b/main.go
index aa22eb0..018585b 100644
--- a/main.go
+++ b/main.go
@@ -72,6 +72,11 @@ func handleMicroPub(w http.ResponseWriter, r *http.Request) {
 			go func() {
 				time.Sleep(10 * time.Second)
 				Purge(location)
+				// Send webmentions
+				go func() {
+					time.Sleep(3 * time.Second)
+					SendWebmentions(location)
+				}()
 			}()
 			return
 		}
diff --git a/webmention.go b/webmention.go
new file mode 100644
index 0000000..4de945d
--- /dev/null
+++ b/webmention.go
@@ -0,0 +1,31 @@
+package main
+
+import (
+	"log"
+	"strings"
+	"willnorris.com/go/webmention"
+)
+
+func SendWebmentions(url string) {
+	client := webmention.New(nil)
+	dl, err := client.DiscoverLinks(url, ".h-entry")
+	if err != nil {
+		return
+	}
+	for _, link := range dl {
+		blogUrl, err := GetBlogURL()
+		if err != nil || strings.HasPrefix(link, blogUrl) {
+			continue
+		}
+		endpoint, err := client.DiscoverEndpoint(link)
+		if err != nil || len(endpoint) < 1 {
+			continue
+		}
+		_, err = client.SendWebmention(endpoint, url, link)
+		if err != nil {
+			log.Println("Sent webmention to " + link + " failed")
+			continue
+		}
+		log.Println("Sent webmention to " + link)
+	}
+}