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Code Issues Releases Wiki Activity

Basic error checking

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Cadence Fish 2020-01-27 19:03:28 +13:00
parent c2ac1b2259
commit 9f5fa84f9a
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GPG Key ID: 81015DF9AA8607E1
9 changed files with 156 additions and 49 deletions
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28
src/lib/collectors.js
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@ -10,13 +10,16 @@ const timelineEntryCache = new TtlCache(constants.resource_cache_time)
function fetchUser(username) {
return requestCache.getOrFetch("user/"+username, () => {
return request(`https://www.instagram.com/${username}/`).then(res => res.text()).then(text => {
// require down here or have to deal with require loop. require cache will take care of it anyway.
// User -> Timeline -> TimelineImage -> collectors -/> User
const User = require("./structures/User")
const sharedData = extractSharedData(text)
const user = new User(sharedData.entry_data.ProfilePage[0].graphql.user)
return user
return request(`https://www.instagram.com/${username}/`).then(res => {
if (res.status === 404) throw constants.symbols.NOT_FOUND
else return res.text().then(text => {
// require down here or have to deal with require loop. require cache will take care of it anyway.
// User -> Timeline -> TimelineImage -> collectors -/> User
const User = require("./structures/User")
const sharedData = extractSharedData(text)
const user = new User(sharedData.entry_data.ProfilePage[0].graphql.user)
return user
})
})
})
}
@ -24,7 +27,7 @@ function fetchUser(username) {
/**
* @param {string} userID
* @param {string} after
* @returns {Promise<import("./types").PagedEdges<import("./types").GraphImage>>}
* @returns {Promise<import("./types").PagedEdges<import("./types").TimelineEntryN2>>}
*/
function fetchTimelinePage(userID, after) {
const p = new URLSearchParams()
@ -36,7 +39,7 @@ function fetchTimelinePage(userID, after) {
}))
return requestCache.getOrFetchPromise("page/"+after, () => {
return request(`https://www.instagram.com/graphql/query/?${p.toString()}`).then(res => res.json()).then(root => {
/** @type {import("./types").PagedEdges<import("./types").GraphImage>} */
/** @type {import("./types").PagedEdges<import("./types").TimelineEntryN2>} */
const timeline = root.data.user.edge_owner_to_timeline_media
return timeline
})
@ -86,7 +89,12 @@ function fetchShortcodeData(shortcode) {
return request(`https://www.instagram.com/graphql/query/?${p.toString()}`).then(res => res.json()).then(root => {
/** @type {import("./types").TimelineEntryN3} */
const data = root.data.shortcode_media
return data
if (data == null) {
// the thing doesn't exist
throw constants.symbols.NOT_FOUND
} else {
return data
}
})
})
}

4
src/lib/constants.js
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@ -16,6 +16,8 @@ module.exports = {
TYPE_VIDEO: Symbol("TYPE_VIDEO"),
TYPE_GALLERY: Symbol("TYPE_GALLERY"),
TYPE_GALLERY_IMAGE: Symbol("TYPE_GALLERY_IMAGE"),
TYPE_GALLERY_VIDEO: Symbol("TYPE_GALLERY_VIDEO")
TYPE_GALLERY_VIDEO: Symbol("TYPE_GALLERY_VIDEO"),
NOT_FOUND: Symbol("NOT_FOUND"),
NO_SHARED_DATA: Symbol("NO_SHARED_DATA")
}
}

11
src/lib/structures/TimelineEntry.js
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@ -19,8 +19,9 @@ class TimelineEntry extends TimelineBaseMethods {
/** @type {import("../types").TimelineEntryAll} some properties may not be available yet! */
// @ts-ignore
this.data = {}
const error = new Error("TimelineEntry data was not initalised in same event loop (missing __typename)") // initialise here for a useful stack trace
setImmediate(() => { // next event loop
if (!this.data.__typename) throw new Error("TimelineEntry data was not initalised in same event loop (missing __typename)")
if (!this.data.__typename) throw error
})
/** @type {string} Not available until fetchExtendedOwnerP is called */
this.ownerPfpCacheP = null
@ -29,8 +30,12 @@ class TimelineEntry extends TimelineBaseMethods {
}
async update() {
const data = await collectors.fetchShortcodeData(this.data.shortcode)
this.applyN3(data)
return collectors.fetchShortcodeData(this.data.shortcode).then(data => {
this.applyN3(data)
}).catch(error => {
console.error("TimelineEntry could not self-update; trying to continue anyway...")
console.error("E:", error)
})
}
/**

4
src/lib/utils/body.js
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@ -1,3 +1,4 @@
const constants = require("../constants")
const {Parser} = require("./parser/parser")
/**
@ -5,7 +6,8 @@ const {Parser} = require("./parser/parser")
*/
function extractSharedData(text) {
const parser = new Parser(text)
parser.seek("window._sharedData = ", {moveToMatch: true, useEnd: true})
const index = parser.seek("window._sharedData = ", {moveToMatch: true, useEnd: true})
if (index === -1) throw constants.symbols.NO_SHARED_DATA
parser.store()
const end = parser.seek(";</script>")
parser.restore()

29
src/site/api/feed.js
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@ -3,14 +3,25 @@ const {fetchUser} = require("../../lib/collectors")
const {render} = require("pinski/plugins")
module.exports = [
{route: `/u/(${constants.external.username_regex})/rss.xml`, methods: ["GET"], code: async ({url, fill}) => {
const user = await fetchUser(fill[0])
const content = await user.timeline.fetchFeed()
const xml = content.xml()
return {
statusCode: 200,
contentType: "application/rss+xml", // see https://stackoverflow.com/questions/595616/what-is-the-correct-mime-type-to-use-for-an-rss-feed
content: xml
}
{route: `/u/(${constants.external.username_regex})/rss.xml`, methods: ["GET"], code: ({fill}) => {
return fetchUser(fill[0]).then(async user => {
const content = await user.timeline.fetchFeed()
const xml = content.xml()
return {
statusCode: 200,
contentType: "application/rss+xml", // see https://stackoverflow.com/questions/595616/what-is-the-correct-mime-type-to-use-for-an-rss-feed
content: xml
}
}).catch(error => {
if (error === constants.symbols.NOT_FOUND) {
return render(404, "pug/friendlyerror.pug", {
statusCode: 404,
title: "Not found",
message: "This user doesn't exist."
})
} else {
throw error
}
})
}}
]

81
src/site/api/routes.js
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@ -4,39 +4,72 @@ const {render} = require("pinski/plugins")
module.exports = [
{
route: `/u/(${constants.external.username_regex})`, methods: ["GET"], code: async ({url, fill}) => {
route: `/u/(${constants.external.username_regex})`, methods: ["GET"], code: ({url, fill}) => {
const params = url.searchParams
const user = await fetchUser(fill[0])
const page = +params.get("page")
if (typeof page === "number" && !isNaN(page) && page >= 1) {
await user.timeline.fetchUpToPage(page - 1)
}
return render(200, "pug/user.pug", {url, user})
return fetchUser(fill[0]).then(async user => {
const page = +params.get("page")
if (typeof page === "number" && !isNaN(page) && page >= 1) {
await user.timeline.fetchUpToPage(page - 1)
}
return render(200, "pug/user.pug", {url, user})
}).catch(error => {
if (error === constants.symbols.NOT_FOUND) {
return render(404, "pug/friendlyerror.pug", {
statusCode: 404,
title: "Not found",
message: "This user doesn't exist."
})
} else {
throw error
}
})
}
},
{
route: `/fragment/user/(${constants.external.username_regex})/(\\d+)`, methods: ["GET"], code: async ({url, fill}) => {
const user = await fetchUser(fill[0])
const pageNumber = +fill[1]
const pageIndex = pageNumber - 1
await user.timeline.fetchUpToPage(pageIndex)
if (user.timeline.pages[pageIndex]) {
return render(200, "pug/fragments/timeline_page.pug", {page: user.timeline.pages[pageIndex], pageIndex, user, url})
} else {
return {
statusCode: 400,
contentType: "text/html",
content: "That page does not exist"
return fetchUser(fill[0]).then(async user => {
const pageNumber = +fill[1]
const pageIndex = pageNumber - 1
await user.timeline.fetchUpToPage(pageIndex)
if (user.timeline.pages[pageIndex]) {
return render(200, "pug/fragments/timeline_page.pug", {page: user.timeline.pages[pageIndex], pageIndex, user, url})
} else {
return {
statusCode: 400,
contentType: "text/html",
content: "That page does not exist"
}
}
}
}).catch(error => {
if (error === constants.symbols.NOT_FOUND) {
return render(404, "pug/friendlyerror.pug", {
statusCode: 404,
title: "Not found",
message: "This user doesn't exist."
})
} else {
throw error
}
})
}
},
{
route: `/p/(${constants.external.shortcode_regex})`, methods: ["GET"], code: async ({fill}) => {
const post = await getOrFetchShortcode(fill[0])
await post.fetchChildren()
await post.fetchExtendedOwnerP() // parallel await is okay since intermediate fetch result is cached
return render(200, "pug/post.pug", {post})
route: `/p/(${constants.external.shortcode_regex})`, methods: ["GET"], code: ({fill}) => {
return getOrFetchShortcode(fill[0]).then(async post => {
await post.fetchChildren()
await post.fetchExtendedOwnerP() // parallel await is okay since intermediate fetch result is cached
return render(200, "pug/post.pug", {post})
}).catch(error => {
if (error === constants.symbols.NOT_FOUND) {
return render(404, "pug/friendlyerror.pug", {
statusCode: 404,
title: "Not found",
message: "Somehow, you reached a post that doesn't exist."
})
} else {
throw error
}
})
}
}
]

1
src/site/html/static/js/pagination.js
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@ -36,7 +36,6 @@ class NextPage extends FreezeWidth {
fetch(`/fragment/user/${this.element.getAttribute("data-username")}/${this.nextPageNumber}`).then(res => res.text()).then(text => {
q("#next-page-container").remove()
this.observer.disconnect()
q("#timeline").insertAdjacentHTML("beforeend", text)
addNextPageControl()
})

18
src/site/pug/friendlyerror.pug Normal file
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@ -0,0 +1,18 @@
//- Needs title, message, statusCode
include includes/timeline_page.pug
include includes/next_page_button.pug
- const numberFormat = new Intl.NumberFormat().format
doctype html
html
head
meta(charset="utf-8")
meta(name="viewport" content="width=device-width, initial-scale=1")
title= `${title} | Bibliogram`
link(rel="stylesheet" type="text/css" href="/static/css/main.css")
body.error-page
h1.code= statusCode
p.message= message
a(href="javascript:history.back()").back ← Go back?

29
src/site/sass/main.sass
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@ -242,3 +242,32 @@ body
&:not(:last-child)
margin-bottom: 10px
.error-page
min-height: 100vh
background: #191919
padding: 10px
text-align: center
display: flex
flex-direction: column
justify-content: center
align-items: center
.code, .message, .back-link
line-height: 1.2
margin: 0px
color: white
.code
font-size: 80px
color: #fff
margin-bottom: 25px
.message
font-size: 35px
color: #ccc
margin-bottom: 15vh
.back
color: #4a93d2
font-size: 25px