From ef4e55053600ff6bf44b813d0eafdefd53f83abf Mon Sep 17 00:00:00 2001
From: Fornax <wim@fornaxian.tech>
Date: Sun, 28 Nov 2021 21:42:01 +0100
Subject: [PATCH] Add coupon management functions

---
 go.mod                                      |   2 +-
 go.sum                                      |   4 +-
 svelte/src/admin_panel/Subscriptions.svelte | 146 ++++++++++++++++++--
 svelte/src/file_viewer/EmbedWindow.svelte   |  10 +-
 webcontroller/subscription_activate.go      |  66 +++++++++
 webcontroller/web_controller.go             |  11 +-
 6 files changed, 221 insertions(+), 18 deletions(-)

diff --git a/go.mod b/go.mod
index fb43f83..1550f56 100644
--- a/go.mod
+++ b/go.mod
@@ -5,7 +5,7 @@ go 1.17
 require (
 	fornaxian.tech/config v0.0.0-20211108212237-6133aed90586
 	fornaxian.tech/log v0.0.0-20211102185326-552e9b1f8640
-	fornaxian.tech/pixeldrain_api_client v0.0.0-20211123215854-be6e25030ad8
+	fornaxian.tech/pixeldrain_api_client v0.0.0-20211128192613-093515ebeaa7
 	fornaxian.tech/util v0.0.0-20211102152345-9a486dee9787
 	github.com/julienschmidt/httprouter v1.3.0
 	github.com/microcosm-cc/bluemonday v1.0.16
diff --git a/go.sum b/go.sum
index d1d02d1..a8985b1 100644
--- a/go.sum
+++ b/go.sum
@@ -3,8 +3,8 @@ fornaxian.tech/config v0.0.0-20211108212237-6133aed90586/go.mod h1:ULIXF4J1DbBw4
 fornaxian.tech/log v0.0.0-20190617093801-1c7ce9a7c9b3/go.mod h1:OyWUNsNPlo5AmlOHvJ4s6WcStQw+9rQyBMwmTz0buEM=
 fornaxian.tech/log v0.0.0-20211102185326-552e9b1f8640 h1:UPDxJwLRCfh/cv80UMSanzmZ0jIcfS1mcd0Y06HYuLw=
 fornaxian.tech/log v0.0.0-20211102185326-552e9b1f8640/go.mod h1:sN82qMToeHhP2u3ehvrcE8y1IudRZJAZO9yG5OBYblo=
-fornaxian.tech/pixeldrain_api_client v0.0.0-20211123215854-be6e25030ad8 h1:0ueAJb5nHOpFa5TXZgVVs4ORsf2zhpxLRUx3AuAx+wM=
-fornaxian.tech/pixeldrain_api_client v0.0.0-20211123215854-be6e25030ad8/go.mod h1:uajB2ofEsefUtxjvs4m7SDyPVRlfrI3qzCSWcud47hY=
+fornaxian.tech/pixeldrain_api_client v0.0.0-20211128192613-093515ebeaa7 h1:Gx7SRu906VslyPcIL9D3uw3B2uO6u7mIwsMD7SPr+9k=
+fornaxian.tech/pixeldrain_api_client v0.0.0-20211128192613-093515ebeaa7/go.mod h1:uajB2ofEsefUtxjvs4m7SDyPVRlfrI3qzCSWcud47hY=
 fornaxian.tech/util v0.0.0-20211102152345-9a486dee9787 h1:9ujI8Qi6+FTL/YW6xQAS9DmWDMerHBe8foQvVD/G/i0=
 fornaxian.tech/util v0.0.0-20211102152345-9a486dee9787/go.mod h1:FqVgfghmxTGR3l9Zx4MOMeZ9KHjiEFl3s3C0BSTvBwk=
 github.com/BurntSushi/toml v0.4.1 h1:GaI7EiDXDRfa8VshkTj7Fym7ha+y8/XxIgD2okUIjLw=
diff --git a/svelte/src/admin_panel/Subscriptions.svelte b/svelte/src/admin_panel/Subscriptions.svelte
index ccc1161..8342213 100644
--- a/svelte/src/admin_panel/Subscriptions.svelte
+++ b/svelte/src/admin_panel/Subscriptions.svelte
@@ -1,7 +1,10 @@
 <script>
 import { onMount } from "svelte";
-
+import Euro from "../util/Euro.svelte";
 import Form from "./../util/Form.svelte";
+import Spinner from "../util/Spinner.svelte";
+
+let loading = true
 
 let credit_form = {
 	name: "give_credit",
@@ -54,17 +57,140 @@ let credit_form = {
 		return {success: true, message: "Success: Granted user "+fields.credit+" credits"}
 	},
 }
+
+let coupon_form = {
+	name: "make_coupon",
+	fields: [
+		{
+			name: "id",
+			label: "Code",
+			type: "text",
+			default_value: "",
+		}, {
+			name: "credit",
+			label: "Credit",
+			type: "decimal",
+			default_value: 0,
+		}, {
+			name: "uses",
+			label: "Uses",
+			type: "number",
+			default_value: "",
+		},
+	],
+	submit_label: `<i class="icon">send</i> Create`,
+	on_submit: async fields => {
+		const form = new FormData()
+		form.append("id", fields.id)
+		form.append("credit", fields.credit*1e6)
+		form.append("uses", fields.uses)
+
+		const resp = await fetch(
+			window.api_endpoint+"/coupon",
+			{ method: "POST", body: form }
+		);
+		if(resp.status >= 400) {
+			return {error_json: await resp.json()}
+		}
+
+		get_coupons()
+		return {success: true, message: "Success: Coupon created"}
+	},
+}
+
+let coupons = []
+const get_coupons = async () => {
+	loading = true;
+	try {
+		const resp = await fetch(window.api_endpoint+"/coupon");
+		if(resp.status >= 400) {
+			throw new Error(resp.text());
+		}
+		coupons = await resp.json()
+		coupons.sort((a, b) => {
+			return a.id.localeCompare(b.id)
+		});
+	} catch (err) {
+		alert(err);
+	} finally {
+		loading = false;
+	}
+};
+const delete_coupon = async (id) => {
+	if (!confirm("Delete this coupon code?\n\n"+id)) {
+		return
+	}
+
+	try {
+		const resp = await fetch(
+			window.api_endpoint+"/coupon/"+encodeURI(id),
+			{ method: "DELETE" }
+		);
+		if(resp.status >= 400) {
+			throw new Error(await resp.text());
+		}
+	} catch (err) {
+		alert("Failed to delete ban! "+err)
+	}
+
+	get_coupons();
+}
+onMount(get_coupons)
+
 </script>
 
-<div>
-	<div class="limit_width">
-		<h2>Give user credit</h2>
-		<p>
-			This adds credit to a user's account. You only need to enter one of
-			the user id, username or email.
-		</p>
-		<div class="highlight_dark">
-			<Form config={credit_form}></Form>
+<div class="limit_width">
+	{#if loading}
+		<div class="spinner_container">
+			<Spinner />
 		</div>
+	{/if}
+	<h2>Give user credit</h2>
+	<p>
+		This adds credit to a user's account. You only need to enter one of
+		the user id, username or email.
+	</p>
+	<div class="highlight_dark">
+		<Form config={credit_form}></Form>
+	</div>
+
+	<h2>Create coupon codes</h2>
+	<div class="highlight_dark">
+		<Form config={coupon_form}></Form>
+	</div>
+
+	<h3>Active coupon codes</h3>
+	<div class="table_scroll">
+		<table style="text-align: left;">
+			<tr>
+				<td>ID</td>
+				<td>Uses</td>
+				<td>Credit</td>
+				<td></td>
+			</tr>
+			{#each coupons as row (row.id)}
+				<tr>
+					<td>{row.id}</td>
+					<td>{row.uses}</td>
+					<td><Euro amount={row.credit}></Euro></td>
+					<td>
+						<button on:click|preventDefault={() => {delete_coupon(row.id)}} class="button button_red round">
+							<i class="icon">delete</i>
+						</button>
+					</td>
+				</tr>
+			{/each}
+		</table>
 	</div>
 </div>
+
+<style>
+.spinner_container {
+	position: absolute;
+	top: 10px;
+	left: 10px;
+	height: 100px;
+	width: 100px;
+	z-index: 1000;
+}
+</style>
diff --git a/svelte/src/file_viewer/EmbedWindow.svelte b/svelte/src/file_viewer/EmbedWindow.svelte
index 0f78a29..b6242f9 100644
--- a/svelte/src/file_viewer/EmbedWindow.svelte
+++ b/svelte/src/file_viewer/EmbedWindow.svelte
@@ -164,6 +164,14 @@ const example = () => {
 				Deep sea
 			</button>
 		</div>
+	{:else}
+		<h3>Direct link</h3>
+		<p>
+			You can directly download the file from this link without using the
+			file viewer:
+			<br/>
+			{domain_url()}{file.get_href}
+		</p>
 	{/if}
 
 	<h3>Code</h3>
@@ -171,7 +179,7 @@ const example = () => {
 		Put this code in your website to embed the file.
 	</p>
 	<div class="center">
-		<textarea bind:value={embed_html} style="width: 95%; height: 4em;"></textarea>
+		<textarea bind:value={embed_html} style="width: 96%; height: 4em;"></textarea>
 		<br/>
 		<button on:click={copy} class:button_highlight={copy_status === "success"} class:button_red={copy_status === "error"}>
 			<i class="icon">content_copy</i>
diff --git a/webcontroller/subscription_activate.go b/webcontroller/subscription_activate.go
index 49801ba..45dcc03 100644
--- a/webcontroller/subscription_activate.go
+++ b/webcontroller/subscription_activate.go
@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"html/template"
 	"net/http"
+	"strconv"
 	"time"
 )
 
@@ -175,3 +176,68 @@ func (wc *WebController) knoxfsLinkForm(td *TemplateData, r *http.Request) (f Fo
 	}
 	return f
 }
+
+func (wc *WebController) couponForm(td *TemplateData, r *http.Request) (f Form) {
+	f.Name = "redeem_coupon"
+	f.Title = "Redeem coupon code"
+	f.SubmitLabel = "Redeem"
+
+	if r.FormValue("code") == "" {
+		f.Submitted = true
+		f.SubmitMessages = []template.HTML{"Coupon code not found"}
+		return f
+	}
+
+	coupon, err := td.PixelAPI.GetCouponID(r.FormValue("code"))
+	if err != nil && err.Error() == "not_found" {
+		f.Submitted = true
+		f.SubmitMessages = []template.HTML{"Coupon code not found"}
+		return f
+	} else if err != nil {
+		f.Submitted = true
+		formAPIError(err, &f)
+		return f
+	}
+
+	f.Fields = []Field{{
+		Name:         "1",
+		Label:        "",
+		DefaultValue: "",
+		Description: `When redeeming this coupon code the value will be ` +
+			`added to your pixeldrain account. Go to the ` +
+			`<a href="/user/subscription" target="_blank">subscription page</a> ` +
+			`afterwards to activate your subscription.`,
+		Type: FieldTypeDescription,
+	}, {
+		Name:         "2",
+		Label:        "Coupon value:",
+		DefaultValue: fmt.Sprintf("€ %.2f", float64(coupon.Credit)/1e6),
+		Type:         FieldTypeDescription,
+	}, {
+		Name:         "2",
+		Label:        "Coupon uses left:",
+		DefaultValue: strconv.Itoa(coupon.Uses),
+		Type:         FieldTypeDescription,
+	}}
+
+	if coupon.Uses < 1 {
+		f.Submitted = true
+		f.SubmitMessages = []template.HTML{"Coupon has been used up"}
+		return f
+	}
+
+	if f.ReadInput(r) {
+		if err := td.PixelAPI.PostCouponRedeem(r.FormValue("code")); err != nil {
+			formAPIError(err, &f)
+		} else {
+			// Request was a success
+			f.SubmitSuccess = true
+			f.SubmitMessages = []template.HTML{template.HTML(
+				`Success! Your account credit has been increased. Visit the ` +
+					`<a href="/user/subscription">subscription page</a> to ` +
+					`activate your subscription`,
+			)}
+		}
+	}
+	return f
+}
diff --git a/webcontroller/web_controller.go b/webcontroller/web_controller.go
index e78c325..b33c807 100644
--- a/webcontroller/web_controller.go
+++ b/webcontroller/web_controller.go
@@ -184,11 +184,14 @@ func New(
 		{GET, "user/password_reset_confirm" /**/, wc.serveForm(wc.passwordResetConfirmForm, handlerOpts{NoEmbed: true})},
 		{PST, "user/password_reset_confirm" /**/, wc.serveForm(wc.passwordResetConfirmForm, handlerOpts{NoEmbed: true})},
 
-		{GET, "patreon_activate" /*  */, wc.serveForm(wc.patreonLinkForm, handlerOpts{Auth: true})},
-		{PST, "patreon_activate" /*  */, wc.serveForm(wc.patreonLinkForm, handlerOpts{Auth: true})},
+		{GET, "patreon_activate", wc.serveForm(wc.patreonLinkForm, handlerOpts{Auth: true})},
+		{PST, "patreon_activate", wc.serveForm(wc.patreonLinkForm, handlerOpts{Auth: true})},
 
-		{GET, "knoxfs_activate" /*  */, wc.serveForm(wc.knoxfsLinkForm, handlerOpts{Auth: true})},
-		{PST, "knoxfs_activate" /*  */, wc.serveForm(wc.knoxfsLinkForm, handlerOpts{Auth: true})},
+		{GET, "knoxfs_activate", wc.serveForm(wc.knoxfsLinkForm, handlerOpts{Auth: true})},
+		{PST, "knoxfs_activate", wc.serveForm(wc.knoxfsLinkForm, handlerOpts{Auth: true})},
+
+		{GET, "coupon_redeem", wc.serveForm(wc.couponForm, handlerOpts{Auth: true})},
+		{PST, "coupon_redeem", wc.serveForm(wc.couponForm, handlerOpts{Auth: true})},
 
 		// Admin settings
 		{GET, "admin" /*                */, wc.serveTemplate("admin", handlerOpts{Auth: true})},