POC works

.gitignore

@@ -1,2 +1,4 @@
 /target
 **/*.rs.bk
+.DS_Store
+out

example/feed.json

@@ -0,0 +1,106 @@
+{
+  "_items": [
+    {
+      "_id": "111111111111111111111",
+      "time": "2019-01-01T00:00:00.000Z",
+      "targetId": "123targetit",
+      "targetType": "school",
+      "senderId": "123senderid",
+      "pending": false,
+      "private": false,
+      "scheduled": false,
+      "headerText": "Dr. Doctor",
+      "headerSubtext": "The Academy",
+      "headerAvatarURL": "https://images.classdojo.com/dojoprofilephotos/xyz.jpg",
+      "senderName": "Dr. Doctor",
+      "tags": [],
+      "read": true,
+      "likeButton": "unliked",
+      "commentButton": "disabled",
+      "canDelete": false,
+      "canEdit": false,
+      "readCount": 0,
+      "likeCount": 5,
+      "commentCount": 0,
+      "type": "textAndAttachment",
+      "contents": {
+        "body": "What a great body this is",
+        "attachments": [
+          {
+            "contentType": "image/jpeg",
+            "path": "https://images.classdojo.com/dojophotos/def.jpg",
+            "metadata": { "width": 1000, "height": 1000 },
+            "type": "photo",
+            "_id": "123attachmentid"
+          }
+        ],
+        "sentLanguage": "en",
+        "translation": null
+      },
+      "webview": {
+        "url": "https://mw.classdojo.com/story/test",
+        "approximateHeight": 100
+      }
+    }
+  ],
+  "_metadata": {
+    "postsExist": true,
+    "expiresAfter": 0,
+    "availableTranslations": [
+      "af",
+      "am",
+      "ar",
+      "be",
+      "bg",
+      "bn",
+      "ca",
+      "cs",
+      "cy",
+      "da",
+      "de",
+      "el",
+      "en",
+      "es",
+      "et",
+      "eu",
+      "fa",
+      "fi",
+      "fr",
+      "ga",
+      "gl",
+      "hi",
+      "hr",
+      "hu",
+      "id",
+      "it",
+      "ja",
+      "kk",
+      "ko",
+      "lt",
+      "lv",
+      "ml",
+      "ms",
+      "nl",
+      "pl",
+      "pt",
+      "ro",
+      "ru",
+      "sk",
+      "sl",
+      "sr",
+      "sv",
+      "sw",
+      "ta",
+      "te",
+      "th",
+      "tr",
+      "uk",
+      "vi",
+      "zh-CN",
+      "zh-TW",
+      "zh",
+      "zu"
+    ]
+  },
+  "_links": {}
+}

src/main.rs

@@ -1,6 +1,17 @@
 use reqwest::Client;
-use serde::Deserialize;
+use serde::{Deserialize, Serialize};
+use std::env;
 use std::error::Error;
+use std::fs;
+use std::fs::File;
+use std::path::Path;
+
+#[derive(Debug, Serialize)]
+#[serde(rename_all = "camelCase")]
+struct Credentials<'a> {
+    login: &'a str,
+    password: &'a str,
+}
 
 #[derive(Debug, Deserialize)]
 #[serde(rename_all = "camelCase")]
@@ -34,20 +45,58 @@ struct Feed {
     items: Vec<FeedItem>,
 }
 
-fn authenticate() {}
+fn fetch_feed(client: &Client) -> Result<Feed, reqwest::Error> {
+    client
+        .get("https://home.classdojo.com/api/storyFeed?includePrivate=true")
+        .send()?
+        .json::<Feed>()
+}
+
+fn authenticate(
+    client: &Client,
+    credentials: &Credentials,
+) -> Result<reqwest::StatusCode, reqwest::Error> {
+    let response = client
+        .post("https://home.classdojo.com/api/session")
+        .json(&credentials)
+        .send()?;
+    Ok(response.status())
+}
+
+fn fetch_attachment(client: &Client, attachment: &FeedAttachment) -> Result<(), Box<dyn Error>> {
+    let raw_path = &format!("out/{}.jpg", attachment.id);
+    let path = Path::new(raw_path);
+    if path.exists() {
+        return Ok(());
+    }
+
+    let mut file = File::create(path)?;
+    let mut response = client.get(&attachment.path).send()?;
+    response.copy_to(&mut file)?;
+    Ok(())
+}
+
+fn process_feed(client: &Client, feed: Feed) {
+    for item in feed.items {
+        for attachment in item.contents.attachments {
+            if let Err(e) = fetch_attachment(&client, &attachment) {
+                println!("Failed to save attachment {}. {}", &attachment.id, e);
+                return;
+            }
+        }
+    }
+}
 
 fn main() -> Result<(), Box<dyn Error>> {
     let client = Client::builder().cookie_store(true).build()?;
-    let feed: Feed = client
-        .get("http://localhost:2015/feed.json")
-        .send()?
-        .json()?;
-    println!("{:?}", feed);
-    let feed2: Feed = client
-        .get("http://localhost:2015/feed.json")
-        .send()?
-        .json()?;
-    println!("{:?}", feed2);
+    let credentials = Credentials {
+        login: &env::var("CLASSDOJO_LOGIN")?,
+        password: &env::var("CLASSDOJO_PASSWORD")?,
+    };
+    authenticate(&client, &credentials)?;
+    let feed = fetch_feed(&client)?;
+    fs::create_dir_all("out")?;
+    process_feed(&client, feed);
 
     Ok(())
 }