Merge branch '3-orange-pill-hn' into 'develop'

Resolve "Orange-pill HN"

Closes #3

See merge request ekzyis/hnbot!2

.env.template

@@ -1 +1,3 @@
-NEXT_AUTH_CSRF_TOKEN=
+SN_AUTH_COOKIE=
+SN_USERNAME=hn
+HN_AUTH_COOKIE=

go.mod

@@ -4,6 +4,7 @@ go 1.20
 
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/dustin/go-humanize v1.0.1 // indirect
 	github.com/joho/godotenv v1.5.1 // indirect
 	github.com/namsral/flag v1.7.4-pre // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect

go.sum

@@ -1,6 +1,8 @@
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
+github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
 github.com/joho/godotenv v1.5.1 h1:7eLL/+HRGLY0ldzfGMeQkb7vMd0as4CfYvUVzLqw0N0=
 github.com/joho/godotenv v1.5.1/go.mod h1:f4LDr5Voq0i2e/R5DDNOoa2zzDfwtkZa6DnEwAbqwq4=
 github.com/namsral/flag v1.7.4-pre h1:b2ScHhoCUkbsq0d2C15Mv+VU8bl8hAXV8arnWiOHNZs=

hn.go

@@ -3,8 +3,16 @@ package main
 import (
 	"encoding/json"
 	"fmt"
+	"io/ioutil"
 	"log"
 	"net/http"
+	"net/url"
+	"regexp"
+	"strconv"
+	"strings"
+
+	"github.com/joho/godotenv"
+	"github.com/namsral/flag"
 )
 
 type ItemID = int
@@ -20,10 +28,30 @@ type Story struct {
 	Url         string
 }
 
-func fetchTopStoriesFromHN() []Story {
+var (
+	HackerNewsUrl         string
+	HackerNewsFirebaseUrl string
+	HnAuthCookie          string
+)
+
+func init() {
+	HackerNewsUrl = "https://news.ycombinator.com"
+	HackerNewsFirebaseUrl = "https://hacker-news.firebaseio.com/v0"
+	err := godotenv.Load()
+	if err != nil {
+		log.Fatal("Error loading .env file")
+	}
+	flag.StringVar(&HnAuthCookie, "HN_AUTH_COOKIE", "", "Cookie required for authorizing requests to news.ycombinator.com")
+	flag.Parse()
+	if HnAuthCookie == "" {
+		log.Fatal("HN_AUTH_COOKIE not set")
+	}
+}
+
+func FetchHackerNewsTopStories() []Story {
 	// API docs: https://github.com/HackerNews/API
 
-	url := "https://hacker-news.firebaseio.com/v0/topstories.json"
+	url := fmt.Sprintf("%s/topstories.json", HackerNewsFirebaseUrl)
 	resp, err := http.Get(url)
 	if err != nil {
 		log.Fatal("Error fetching top stories:", err)
@@ -43,7 +71,7 @@ func fetchTopStoriesFromHN() []Story {
 
 	var stories [limit]Story
 	for i, id := range ids {
-		story := fetchStoryByID(id)
+		story := FetchStoryById(id)
 		stories[i] = story
 	}
 
@@ -51,7 +79,7 @@ func fetchTopStoriesFromHN() []Story {
 	return stories[:]
 }
 
-func fetchStoryByID(id ItemID) Story {
+func FetchStoryById(id ItemID) Story {
 	url := fmt.Sprintf("https://hacker-news.firebaseio.com/v0/item/%d.json", id)
 	resp, err := http.Get(url)
 	if err != nil {
@@ -68,3 +96,79 @@ func fetchStoryByID(id ItemID) Story {
 
 	return story
 }
+
+func FetchHackerNewsItemHMAC(id ItemID) string {
+	hnUrl := fmt.Sprintf("%s/item?id=%d", HackerNewsUrl, id)
+	req, err := http.NewRequest("GET", hnUrl, nil)
+	if err != nil {
+		panic(err)
+	}
+	// Cookie header must be set to fetch the correct HMAC for posting comments
+	req.Header.Set("Cookie", HnAuthCookie)
+	client := http.DefaultClient
+	resp, err := client.Do(req)
+	if err != nil {
+		panic(err)
+	}
+	log.Printf("GET %s %d\n", hnUrl, resp.StatusCode)
+
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		log.Fatal("Failed to read response body:", err)
+	}
+
+	// Find HMAC in body
+	re := regexp.MustCompile(`name="hmac" value="([a-z0-9]+)"`)
+	match := re.FindStringSubmatch(string(body))
+	if len(match) == 0 {
+		log.Fatal("No HMAC found")
+	}
+	hmac := match[1]
+
+	return hmac
+}
+
+func CommentHackerNewsStory(text string, id ItemID) {
+	hmac := FetchHackerNewsItemHMAC(id)
+
+	hnUrl := fmt.Sprintf("%s/comment", HackerNewsUrl)
+	data := url.Values{}
+	data.Set("parent", strconv.Itoa(id))
+	data.Set("goto", fmt.Sprintf("item?id=%d", id))
+	data.Set("text", text)
+	data.Set("hmac", hmac)
+	req, err := http.NewRequest("POST", hnUrl, strings.NewReader(data.Encode()))
+	if err != nil {
+		panic(err)
+	}
+	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+	req.Header.Set("Cookie", HnAuthCookie)
+	client := http.DefaultClient
+	resp, err := client.Do(req)
+	if err != nil {
+		panic(err)
+	}
+	defer resp.Body.Close()
+	log.Printf("POST %s %d\n", hnUrl, resp.StatusCode)
+}
+
+func HackerNewsUserLink(user string) string {
+	return fmt.Sprintf("%s/user?id=%s", HackerNewsUrl, user)
+}
+
+func HackerNewsItemLink(id int) string {
+	return fmt.Sprintf("%s/item?id=%d", HackerNewsUrl, id)
+}
+
+func FindHackerNewsItemId(text string) int {
+	re := regexp.MustCompile(fmt.Sprintf(`\[HN\]\(%s/item\?id=([0-9]+)\)`, HackerNewsUrl))
+	match := re.FindStringSubmatch(text)
+	if len(match) == 0 {
+		log.Fatal("No Hacker News item URL found")
+	}
+	id, err := strconv.Atoi(match[1])
+	if err != nil {
+		panic(err)
+	}
+	return id
+}

main.go

@@ -1,14 +1,16 @@
 package main
 
 import (
+	"fmt"
 	"log"
+	"time"
 
 	"github.com/joho/godotenv"
 	"github.com/namsral/flag"
 )
 
 var (
-	SnApiToken string
+	SnUserName string
 )
 
 func init() {
@@ -16,17 +18,71 @@ func init() {
 	if err != nil {
 		log.Fatal("Error loading .env file")
 	}
-	flag.StringVar(&SnApiToken, "NEXT_AUTH_CSRF_TOKEN", "", "Token required for authorizing requests to stacker.news/api/graphql")
+	flag.StringVar(&SnUserName, "SN_USERNAME", "", "Username of bot on SN")
 	flag.Parse()
-	if SnApiToken == "" {
-		log.Fatal("NEXT_AUTH_CSRF_TOKEN not set")
+	if SnUserName == "" {
+		log.Fatal("SN_USERNAME not set")
 	}
 }
 
+func GenerateHnComment(id int, sats int, nComments int) string {
+	lnInvoiceDocs := "https://docs.lightning.engineering/the-lightning-network/payment-lifecycle/understanding-lightning-invoices"
+	return fmt.Sprintf(
+		""+
+			"Your post received %d sats and %d comments on %s [0].\n\n"+
+			"To claim your sats, reply to this comment with a LN address or invoice [1].\n\n"+
+			"You can create a SN account to obtain a LN address.\n"+
+			"\n\n"+
+			"[0] %s/r/%s (referral link)\n\n"+
+			"[1] %s",
+		sats,
+		nComments,
+		StackerNewsUrl,
+		StackerNewsItemLink(id),
+		SnUserName,
+		lnInvoiceDocs,
+	)
+}
+
+func GenerateSnReply(sats int, nComments int) string {
+	return fmt.Sprintf("Notified OP on HN that their post received %d sats and %d comments.", sats, nComments)
+}
+
 func main() {
-	stories := fetchTopStoriesFromHN()
-	filtered := filterByRelevanceForSN(&stories)
+	stories := FetchHackerNewsTopStories()
+	filtered := CurateContentForStackerNews(&stories)
 	for _, story := range *filtered {
-		postToSN(&story)
+		PostStoryToStackerNews(&story)
+	}
+
+	items := FetchStackerNewsUserItems(SnUserName)
+	now := time.Now()
+	for _, item := range *items {
+		duration := now.Sub(item.CreatedAt)
+		if duration >= 24*time.Hour && item.Sats > 0 {
+			log.Printf("Found SN item (id=%d) older than 24 hours with %d sats and %d comments\n", item.Id, item.Sats, item.NComments)
+			for _, comment := range item.Comments {
+				if comment.User.Name == SnUserName {
+					snReply := GenerateSnReply(item.Sats, item.NComments)
+					// Check if OP on HN was already notified
+					alreadyNotified := false
+					for _, comment2 := range comment.Comments {
+						if comment2.User.Name == SnUserName {
+							alreadyNotified = true
+						}
+					}
+					if alreadyNotified {
+						log.Println("OP on HN was already notified")
+						break
+					}
+					text := comment.Text
+					hnItemId := FindHackerNewsItemId(text)
+					hnComment := GenerateHnComment(item.Id, item.Sats, item.NComments)
+					CommentHackerNewsStory(hnComment, hnItemId)
+					CommentStackerNewsPost(snReply, comment.Id)
+					break
+				}
+			}
+		}
 	}
 }

sn.go

@@ -6,6 +6,11 @@ import (
 	"fmt"
 	"log"
 	"net/http"
+	"time"
+
+	"github.com/dustin/go-humanize"
+	"github.com/joho/godotenv"
+	"github.com/namsral/flag"
 )
 
 type GraphQLPayload struct {
@@ -25,19 +30,72 @@ type DupesResponse struct {
 	} `json:"data"`
 }
 
-func makeGraphQLRequest(body GraphQLPayload) *http.Response {
+type User struct {
+	Name string `json:"name"`
+}
+type Comment struct {
+	Id       int       `json:"id,string"`
+	Text     string    `json:"text"`
+	User     User      `json:"user"`
+	Comments []Comment `json:"comments"`
+}
+type Item struct {
+	Id        int       `json:"id,string"`
+	Title     string    `json:"title"`
+	Url       string    `json:"url"`
+	Sats      int       `json:"sats"`
+	CreatedAt time.Time `json:"createdAt"`
+	Comments  []Comment `json:"comments"`
+	NComments int       `json:"ncomments"`
+}
+
+type UpsertLinkResponse struct {
+	Data struct {
+		UpsertLink Item `json:"upsertLink"`
+	} `json:"data"`
+}
+
+type ItemsResponse struct {
+	Data struct {
+		Items struct {
+			Items  []Item `json:"items"`
+			Cursor string `json:"cursor"`
+		} `json:"items"`
+	} `json:"data"`
+}
+
+var (
+	StackerNewsUrl string
+	SnApiUrl       string
+	SnAuthCookie   string
+)
+
+func init() {
+	StackerNewsUrl = "https://stacker.news"
+	SnApiUrl = "https://stacker.news/api/graphql"
+	err := godotenv.Load()
+	if err != nil {
+		log.Fatal("Error loading .env file")
+	}
+	flag.StringVar(&SnAuthCookie, "SN_AUTH_COOKIE", "", "Cookie required for authorizing requests to stacker.news/api/graphql")
+	flag.Parse()
+	if SnAuthCookie == "" {
+		log.Fatal("SN_AUTH_COOKIE not set")
+	}
+}
+
+func MakeStackerNewsRequest(body GraphQLPayload) *http.Response {
 	bodyJSON, err := json.Marshal(body)
 	if err != nil {
 		log.Fatal("Error during json.Marshal:", err)
 	}
 
-	url := "https://stacker.news/api/graphql"
-	req, err := http.NewRequest("POST", url, bytes.NewBuffer(bodyJSON))
+	req, err := http.NewRequest("POST", SnApiUrl, bytes.NewBuffer(bodyJSON))
 	if err != nil {
 		panic(err)
 	}
 	req.Header.Set("Content-Type", "application/json")
-	req.Header.Set("Cookie", fmt.Sprintf("__Host-next-auth.csrf-token=%s", SnApiToken))
+	req.Header.Set("Cookie", SnAuthCookie)
 
 	client := http.DefaultClient
 	resp, err := client.Do(req)
@@ -45,19 +103,19 @@ func makeGraphQLRequest(body GraphQLPayload) *http.Response {
 		panic(err)
 	}
 
-	log.Printf("POST %s %d\n", url, resp.StatusCode)
+	log.Printf("POST %s %d\n", SnApiUrl, resp.StatusCode)
 
 	return resp
 }
 
-func filterByRelevanceForSN(stories *[]Story) *[]Story {
+func CurateContentForStackerNews(stories *[]Story) *[]Story {
 	// TODO: filter by relevance
 
 	slice := (*stories)[0:1]
 	return &slice
 }
 
-func fetchDupes(url string) *[]Dupe {
+func FetchStackerNewsDupes(url string) *[]Dupe {
 	body := GraphQLPayload{
 		Query: `
 			query Dupes($url: String!) {
@@ -71,7 +129,7 @@ func fetchDupes(url string) *[]Dupe {
 			"url": url,
 		},
 	}
-	resp := makeGraphQLRequest(body)
+	resp := MakeStackerNewsRequest(body)
 	defer resp.Body.Close()
 
 	var dupesResp DupesResponse
@@ -83,9 +141,10 @@ func fetchDupes(url string) *[]Dupe {
 	return &dupesResp.Data.Dupes
 }
 
-func postToSN(story *Story) {
-	dupes := fetchDupes(story.Url)
+func PostStoryToStackerNews(story *Story) {
+	dupes := FetchStackerNewsDupes(story.Url)
 	if len(*dupes) > 0 {
+		log.Printf("%s was already posted. Skipping.\n", story.Url)
 		return
 	}
 
@@ -95,13 +154,118 @@ func postToSN(story *Story) {
 				upsertLink(url: $url, title: $title) {
 					id
 				}
-            }
-        `,
+			}`,
 		Variables: map[string]interface{}{
 			"url":   story.Url,
 			"title": story.Title,
 		},
 	}
-	resp := makeGraphQLRequest(body)
+	resp := MakeStackerNewsRequest(body)
+	defer resp.Body.Close()
+
+	var upsertLinkResp UpsertLinkResponse
+	err := json.NewDecoder(resp.Body).Decode(&upsertLinkResp)
+	if err != nil {
+		log.Fatal("Error decoding dupes JSON:", err)
+	}
+	parentId := upsertLinkResp.Data.UpsertLink.Id
+
+	log.Printf("Created new post on SN: id=%d url=%s\n", parentId, story.Url)
+
+	comment := fmt.Sprintf(
+		"This link was posted by [%s](%s) %s on [HN](%s). It received %d points and %d comments.",
+		story.By,
+		HackerNewsUserLink(story.By),
+		humanize.Time(time.Unix(int64(story.Time), 0)),
+		HackerNewsItemLink(story.ID),
+		story.Score, story.Descendants,
+	)
+	CommentStackerNewsPost(comment, parentId)
+
+	log.Printf("Commented post on SN: parentId=%d text='%s'\n", parentId, comment)
+}
+
+func CommentStackerNewsPost(text string, parentId int) {
+	body := GraphQLPayload{
+		Query: `
+			mutation createComment($text: String!, $parentId: ID!) {
+        createComment(text: $text, parentId: $parentId) {
+          id
+        }
+			}`,
+		Variables: map[string]interface{}{
+			"text":     text,
+			"parentId": parentId,
+		},
+	}
+	resp := MakeStackerNewsRequest(body)
 	defer resp.Body.Close()
 }
+
+func FetchStackerNewsUserItems(user string) *[]Item {
+	query := `
+		query items($name: String!, $cursor: String) {
+			items(name: $name, sort: "user", cursor: $cursor) {
+				items {
+					id
+					title
+					url
+					sats
+					createdAt
+					comments {
+						id
+						text
+						user {
+							name
+						}
+						comments {
+							id
+							text
+							user {
+								name
+							}
+						}
+					}
+					ncomments
+				}
+				cursor
+			}
+		}
+	`
+	var items []Item
+	var cursor string
+	for {
+		body := GraphQLPayload{
+			Query: query,
+			Variables: map[string]interface{}{
+				"name":   user,
+				"cursor": cursor,
+			},
+		}
+		resp := MakeStackerNewsRequest(body)
+		defer resp.Body.Close()
+
+		var itemsResp ItemsResponse
+		err := json.NewDecoder(resp.Body).Decode(&itemsResp)
+		if err != nil {
+			log.Fatal("Error decoding items JSON:", err)
+		}
+		fetchedItems := itemsResp.Data.Items.Items
+
+		for _, item := range fetchedItems {
+			items = append(items, item)
+		}
+		if len(fetchedItems) < 21 {
+			break
+		}
+		cursor = itemsResp.Data.Items.Cursor
+	}
+
+	log.Printf("Fetched %d items\n", len(items))
+
+	return &items
+}
+
+func StackerNewsItemLink(id int) string {
+	return fmt.Sprintf("%s/items/%d", StackerNewsUrl, id)
+}

sn_test.go

@@ -9,6 +9,6 @@ import (
 func TestFetchDupes(t *testing.T) {
 	// TODO: mock HTTP request
 	url := "https://en.wikipedia.org/wiki/Dishwasher_salmon"
-	dupes := fetchDupes(url)
+	dupes := FetchStackerNewsDupes(url)
 	assert.NotEmpty(t, *dupes, "Expected at least one duplicate")
 }