Working user and link list, (big)restructure

This is now a workspace consisting of:
  * the pslink app (a wasm frontend for the admin interface)
  * the pslink binary
  * shared - modules for communication between the two above.

shared/Cargo.toml

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+[package]
+authors = ["Dietrich <dietrich@teilgedanken.de>"]
+categories = ["web-programming", "network-programming", "web-programming::http-server", "command-line-utilities"]
+description = "A simple webservice that allows registered users to create short links including qr-codes.\nAnyone can visit the shortened links. This is an ideal setup for small busines or for publishing papers."
+edition = "2018"
+keywords = ["url", "link", "webpage", "actix", "web"]
+license = "MIT OR Apache-2.0"
+name = "shared"
+readme = "../pslink/README.md"
+repository = "https://github.com/enaut/pslink/"
+version = "0.3.1"
+
+[dependencies]
+serde = "1.0"
+chrono = {version = "0.4", features = ["serde"] }
+enum-map = {version="1", features = ["serde"]}

shared/src/apirequests/general.rs

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+use std::ops::Deref;
+
+use serde::{Deserialize, Serialize};
+#[derive(Clone, Deserialize, Serialize, Debug, Default)]
+pub struct Filter {
+    pub sieve: String,
+}
+
+impl Deref for Filter {
+    type Target = String;
+
+    fn deref(&self) -> &Self::Target {
+        &self.sieve
+    }
+}
+
+#[derive(Clone, Deserialize, Serialize, PartialEq, Eq, Debug)]
+pub enum Ordering {
+    Ascending,
+    Descending,
+}
+
+#[derive(Clone, Deserialize, Serialize, Debug)]
+pub struct Operation<T, V> {
+    pub column: T,
+    pub value: V,
+}

shared/src/apirequests/links.rs

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+use enum_map::{Enum, EnumMap};
+use serde::{Deserialize, Serialize};
+
+use super::general::{Filter, Operation, Ordering};
+
+/// A generic list returntype containing the User and a Vec containing e.g. Links or Users
+#[derive(Clone, Deserialize, Serialize, Debug)]
+pub struct LinkRequestForm {
+    pub filter: EnumMap<LinkOverviewColumns, Filter>,
+    pub order: Option<Operation<LinkOverviewColumns, Ordering>>,
+    pub amount: usize,
+}
+
+impl Default for LinkRequestForm {
+    fn default() -> Self {
+        Self {
+            filter: EnumMap::default(),
+            order: None,
+            amount: 20,
+        }
+    }
+}
+
+#[derive(Clone, Deserialize, Serialize, Debug, PartialEq, Eq, Hash, Enum)]
+pub enum LinkOverviewColumns {
+    Code,
+    Description,
+    Target,
+    Author,
+    Statistics,
+}

shared/src/apirequests/mod.rs

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+pub mod general;
+pub mod links;
+pub mod users;

shared/src/apirequests/users.rs

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+use enum_map::{Enum, EnumMap};
+use serde::{Deserialize, Serialize};
+
+use super::general::{Filter, Operation, Ordering};
+
+#[derive(Clone, Deserialize, Serialize, Debug)]
+pub struct UserRequestForm {
+    pub filter: EnumMap<UserOverviewColumns, Filter>,
+    pub order: Option<Operation<UserOverviewColumns, Ordering>>,
+    pub amount: usize,
+}
+
+impl Default for UserRequestForm {
+    fn default() -> Self {
+        Self {
+            filter: EnumMap::default(),
+            order: None,
+            amount: 20,
+        }
+    }
+}
+
+#[derive(Clone, Deserialize, Serialize, Debug, PartialEq, Eq, Hash, Enum)]
+pub enum UserOverviewColumns {
+    Id,
+    Email,
+    Username,
+}

shared/src/datatypes.rs

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+use serde::{Deserialize, Serialize};
+/// A generic list returntype containing the User and a Vec containing e.g. Links or Users
+#[derive(Clone, Deserialize, Serialize)]
+pub struct ListWithOwner<T> {
+    pub user: User,
+    pub list: Vec<T>,
+}
+
+/// A link together with its author and its click-count.
+#[derive(Clone, Deserialize, Serialize, Debug)]
+pub struct FullLink {
+    pub link: Link,
+    pub user: User,
+    pub clicks: Count,
+}
+
+#[derive(PartialEq, Serialize, Deserialize, Clone, Debug)]
+pub struct User {
+    pub id: i64,
+    pub username: String,
+    pub email: String,
+    pub password: String,
+    pub role: i64,
+    pub language: String,
+}
+
+#[derive(Serialize, Deserialize, Clone, Debug)]
+pub struct Link {
+    pub id: i64,
+    pub title: String,
+    pub target: String,
+    pub code: String,
+    pub author: i64,
+    pub created_at: chrono::NaiveDateTime,
+}
+
+#[derive(Serialize, Deserialize, Clone, Debug)]
+pub struct Count {
+    pub number: i32,
+}
+#[derive(Serialize, Debug)]
+pub struct Click {
+    pub id: i64,
+    pub link: i64,
+    pub created_at: chrono::NaiveDateTime,
+}

shared/src/lib.rs

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+pub mod apirequests;
+pub mod datatypes;