Terraform fastly service (#2527)

* define peps fastly frontend with terraform

* add myself as codeowner of terraform/fastly

.github/CODEOWNERS

@@ -9,6 +9,7 @@
 .github/workflows/      @AA-Turner @CAM-Gerlach
 Makefile                @AA-Turner
 requirements.txt        @AA-Turner
+infra/                  @ewdurbin
 
 pep_sphinx_extensions/  @AA-Turner
 AUTHOR_OVERRIDES.csv    @AA-Turner

infra/.gitignore

@@ -0,0 +1,2 @@
+.terraform*
+terraform.tfstate*

infra/config.tf

@@ -0,0 +1,22 @@
+terraform {
+  required_providers {
+    fastly = {
+      source  = "fastly/fastly"
+      version = "1.1.2"
+    }
+  }
+  required_version = ">= 1.1.8"
+  cloud {
+    organization = "psf"
+    workspaces {
+      name = "peps"
+    }
+  }
+}
+variable "fastly_token" {
+  type      = string
+  sensitive = true
+}
+provider "fastly" {
+  api_key = var.fastly_token
+}

infra/main.tf

@@ -0,0 +1,73 @@
+resource "fastly_service_vcl" "peps" {
+  name     = "peps.python.org"
+  activate = true
+  domain { name = "peps.python.org" }
+
+  backend {
+    name          = "GitHub Pages"
+    address       = "python.github.io"
+    port          = 443
+    override_host = "peps.python.org"
+
+    use_ssl           = true
+    ssl_check_cert    = true
+    ssl_cert_hostname = "python.github.io"
+    ssl_sni_hostname  = "python.github.io"
+  }
+
+  header {
+    name          = "HSTS"
+    type          = "response"
+    action        = "set"
+    destination   = "http.Strict-Transport-Security"
+    ignore_if_set = false
+    source        = "\"max-age=300\""
+  }
+
+  request_setting {
+    name      = "Force TLS"
+    force_ssl = true
+  }
+
+  snippet {
+    name    = "serve-rss"
+    type    = "recv"
+    content = <<-EOT
+        if (req.url == "/peps.rss/") {
+          set req.url = "/peps.rss";
+        }
+    EOT
+  }
+
+  snippet {
+    name    = "redirect"
+    type    = "error"
+    content = <<-EOT
+        if (obj.status == 618) {
+          set obj.status = 302;
+          set obj.http.Location = "https://" + req.http.host + req.http.Location;
+          return(deliver);
+        }
+    EOT
+  }
+  snippet {
+    name    = "redirect-numbers"
+    type    = "recv"
+    content = <<-EOT
+        if (req.url ~ "^/(\d|\d\d|\d\d\d|\d\d\d\d)/?$") {
+          set req.http.Location = "/pep-" + std.strpad(re.group.1, 4, "0") + "/";
+          error 618;
+        }
+    EOT
+  }
+  snippet {
+    name    = "left-pad-pep-numbers"
+    type    = "recv"
+    content = <<-EOT
+        if (req.url ~ "^/pep-(\d|\d\d|\d\d\d)/?$") {
+          set req.http.Location = "/pep-" + std.strpad(re.group.1, 4, "0") + "/";
+          error 618;
+        }
+    EOT
+  }
+}