Use sha hashes instead of primary key

Cargo.lock

  "r2d2-diesel 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rocket 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rocket_contrib 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rust-crypto 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_derive 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 1.0.39 (registry+https://github.com/rust-lang/crates.io-index)",
 version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "gcc"
+version = "0.3.55"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "generic-array"
 version = "0.12.0"
  "r2d2 0.8.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "rand"
+version = "0.3.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.53 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rand"
+version = "0.4.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "fuchsia-cprng 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.53 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rdrand 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "rand"
 version = "0.6.5"
  "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "rust-crypto"
+version = "0.2.36"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "gcc 0.3.55 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.53 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.3.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc-serialize 0.3.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "rustc-demangle"
 version = "0.1.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "rustc-serialize"
+version = "0.3.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "rustc_version"
 version = "0.2.3"
 "checksum fuchsia-cprng 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "a06f77d526c1a601b7c4cdd98f54b5eaabffc14d5f2f0296febdc7f357c6d3ba"
 "checksum fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "2e9763c69ebaae630ba35f74888db465e49e259ba1bc0eda7d06f4a067615d82"
 "checksum fuchsia-zircon-sys 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "3dcaa9ae7725d12cdb85b3ad99a434db70b468c09ded17e012d86b5c1010f7a7"
+"checksum gcc 0.3.55 (registry+https://github.com/rust-lang/crates.io-index)" = "8f5f3913fa0bfe7ee1fd8248b6b9f42a5af4b9d65ec2dd2c3c26132b950ecfc2"
 "checksum generic-array 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)" = "3c0f28c2f5bfb5960175af447a2da7c18900693738343dc896ffbcabd9839592"
 "checksum glob 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)" = "8be18de09a56b60ed0edf84bc9df007e30040691af7acd1c41874faac5895bfb"
 "checksum htmlescape 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "e9025058dae765dee5070ec375f591e2ba14638c63feff74f13805a72e523163"
 "checksum quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)" = "faf4799c5d274f3868a4aae320a0a182cbd2baee377b378f080e16a23e9d80db"
 "checksum r2d2 0.8.4 (registry+https://github.com/rust-lang/crates.io-index)" = "9dd8a293251281a4d02848925fcdbbc9f466ddb4965981bb06680359b3d12091"
 "checksum r2d2-diesel 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "eb9c29bad92da76d02bc2c020452ebc3a3fe6fa74cfab91e711c43116e4fb1a3"
+"checksum rand 0.3.23 (registry+https://github.com/rust-lang/crates.io-index)" = "64ac302d8f83c0c1974bf758f6b041c6c8ada916fbb44a609158ca8b064cc76c"
+"checksum rand 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)" = "552840b97013b1a26992c11eac34bdd778e464601a4c2054b5f0bff7c6761293"
 "checksum rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)" = "6d71dacdc3c88c1fde3885a3be3fbab9f35724e6ce99467f7d9c5026132184ca"
 "checksum rand_chacha 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "556d3a1ca6600bfcbab7c7c91ccb085ac7fbbcd70e008a98742e7847f4f7bcef"
 "checksum rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "7a6fdeb83b075e8266dcc8762c22776f6877a63111121f5f8c7411e5be7eed4b"
 "checksum rocket_codegen 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7d907d6d458c859651c1cf4c8fa99b77685082bde0561db6a4600b365058f710"
 "checksum rocket_contrib 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "f73e161dad5730435f51c815a5c6831d2e57b6b4299b1bf609d31b09aa9a2fa7"
 "checksum rocket_http 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ba9d4f2ce5bba6e1b6d3100493bbad63879e99bbf6b4365d61e6f781daab324d"
+"checksum rust-crypto 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)" = "f76d05d3993fd5f4af9434e8e436db163a12a9d40e1a58a726f27a01dfd12a2a"
 "checksum rustc-demangle 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)" = "ccc78bfd5acd7bf3e89cffcf899e5cb1a52d6fafa8dec2739ad70c9577a57288"
+"checksum rustc-serialize 0.3.24 (registry+https://github.com/rust-lang/crates.io-index)" = "dcf128d1287d2ea9d80910b5f1120d0b8eede3fbf1abe91c40d39ea7d51e6fda"
 "checksum rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "138e3e0acb6c9fb258b19b67cb8abd63c00679d2851805ea151465464fe9030a"
 "checksum ryu 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)" = "eb9e9b8cde282a9fe6a42dd4681319bfb63f121b8a8ee9439c6f4107e58a46f7"
 "checksum safemem 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8dca453248a96cb0749e36ccdfe2b0b4e54a61bfef89fb97ec621eb8e0a93dd9"

Cargo.toml

 r2d2 = "0.8.3"
 r2d2-diesel = "1.0.0"
 rocket = "0.4.0"
+rust-crypto = "0.2.36"
 serde = "1.0.82"
 serde_derive = "1.0.82"
 serde_json = "1.0.33"

migrations/2019-05-05-152044_add_uuid_to_snippets/down.sql

+ALTER TABLE snippets DROP COLUMN uuid;

migrations/2019-05-05-152044_add_uuid_to_snippets/up.sql

+ALTER TABLE snippets ADD COLUMN uuid VARCHAR(255) NOT NULL;

src/main.rs

 #![feature(proc_macro_hygiene, decl_macro)]
 
 extern crate chrono;
+extern crate crypto;
 #[macro_use]
 extern crate diesel;
 extern crate dotenv;

src/routes.rs

 
 use crate::connection::DbConn;
 use crate::snippet;
-use crate::snippet::{InsertableSnippet, Snippet};
+use crate::snippet::{ApiSnippet, Snippet};
 
 fn error_response(error: Error) -> Status {
     match error {
     lines: Vec<String>,
 }
 
-#[get("/snippets/<id>")]
-pub fn show_snippet(id: i32, connection: DbConn) -> Template {
+#[get("/snippets/<uuid>")]
+pub fn show_snippet(uuid: String, connection: DbConn) -> Template {
     let mut context: HashMap<&str, Context> = HashMap::new();
-    if let Ok(snippet) = snippet::get(&connection, id) {
+    if let Ok(snippet) = snippet::get(&connection, &uuid) {
         let lines: Vec<String> = snippet
             .formatted_body
             .split('\n')
     }
 }
 
-#[get("/snippets/<id>/raw")]
-pub fn show_raw_snippet(id: i32, connection: DbConn) -> String {
-    match snippet::get(&connection, id) {
+#[get("/snippets/<uuid>/raw")]
+pub fn show_raw_snippet(uuid: String, connection: DbConn) -> String {
+    match snippet::get(&connection, &uuid) {
         Ok(snippet) => snippet.body,
         Err(_) => String::from("Snippet not found"),
     }
 
 #[post("/api/snippets", format = "application/json", data = "<snippet>")]
 pub fn create_snippet(
-    snippet: Json<InsertableSnippet>,
+    snippet: Json<ApiSnippet>,
     connection: DbConn,
 ) -> Result<status::Created<Json<Snippet>>, Status> {
     snippet::insert(snippet.into_inner(), &connection)

src/schema.rs

         created_at -> Nullable<Timestamp>,
         filetype -> Nullable<Varchar>,
         formatted_body -> Text,
+        uuid -> Varchar,
     }
 }

src/snippet.rs

 use chrono::NaiveDateTime;
+use crypto::digest::Digest;
+use crypto::sha2::Sha256;
 use diesel::pg::PgConnection as PGC;
 use diesel::prelude::*;
 use syntect::highlighting::ThemeSet;
 use syntect::parsing::SyntaxSet;
 
 use crate::schema::snippets;
+use crate::schema::snippets::columns::uuid;
 
 #[derive(Queryable, Serialize, Deserialize)]
 pub struct Snippet {
     pub created_at: Option<NaiveDateTime>,
     pub filetype: Option<String>,
     pub formatted_body: String,
+    pub uuid: String,
 }
 
-#[derive(Insertable, AsChangeset, Serialize, Deserialize)]
+#[derive(Serialize, Deserialize)]
+pub struct ApiSnippet {
+    pub title: String,
+    pub body: String,
+    pub filetype: Option<String>,
+}
+
+#[derive(Insertable, AsChangeset)]
 #[table_name = "snippets"]
 pub struct InsertableSnippet {
     pub title: String,
     pub body: String,
     pub filetype: Option<String>,
     pub formatted_body: String,
+    pub uuid: String,
 }
 
 fn format_snippet(filetype: Option<String>, body: String) -> String {
     )
 }
 
-pub fn get(connection: &PGC, id: i32) -> QueryResult<Snippet> {
-    snippets::table.find(id).get_result::<Snippet>(connection)
+fn generate_uuid(snippet: &ApiSnippet) -> String {
+    let mut hasher = Sha256::new();
+    hasher.input_str(&format!("{}{}", snippet.title, snippet.body));
+    hasher.result_str().to_string()
+}
+
+pub fn get(connection: &PGC, snippet_uuid: &str) -> QueryResult<Snippet> {
+    snippets::table
+        .filter(uuid.eq(snippet_uuid))
+        .first(connection)
 }
 
-pub fn insert(snippet: InsertableSnippet, connection: &PGC) -> QueryResult<Snippet> {
+pub fn insert(snippet: ApiSnippet, connection: &PGC) -> QueryResult<Snippet> {
     let body = htmlescape::encode_minimal(&snippet.body.clone());
     let formatted_snippet = InsertableSnippet {
         filetype: snippet.filetype.clone(),
-        title: snippet.title,
+        title: snippet.title.clone(),
         body: body.clone(),
+        uuid: generate_uuid(&snippet),
         formatted_body: format_snippet(snippet.filetype, body),
     };
     diesel::insert_into(snippets::table)

templates/snippets/show.html.tera

     <div class="container">
       <h1 class="header">
         {{ snippet.title }}
-        <a class="header__raw-link" href="/snippets/{{ snippet.id }}/raw">
+        <a class="header__raw-link" href="/snippets/{{ snippet.uuid }}/raw">
           raw
         </a>
       </h1>