feat(examples): Add example for installed-interactive flow.

This PR also depends on the version bump to 0.6.4.

examples/drive_example/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "drive_example"
+version = "0.1.0"
+authors = ["Lewin Bormann <lbo@spheniscida.de>"]
+
+[dependencies]
+yup-oauth2 = "0.6.4"
+google-drive3 = "0.1"
+url = "= 0.5"
+hyper = "0.9"
+serde_json = "0.8"

examples/drive_example/example_client_secret.json

@@ -0,0 +1 @@
+{"installed":{"client_id":"384278056379-tr5pbot1mil66749n639jo54i4840u77.apps.googleusercontent.com","project_id":"sanguine-rhythm-105020","auth_uri":"https://accounts.google.com/o/oauth2/auth","token_uri":"https://accounts.google.com/o/oauth2/token","auth_provider_x509_cert_url":"https://www.googleapis.com/oauth2/v1/certs","client_secret":"QeQUnhzsiO4t--ZGmj9muUAu","redirect_uris":["urn:ietf:wg:oauth:2.0:oob","http://localhost"]}}

examples/drive_example/src/main.rs

@@ -0,0 +1,44 @@
+//! Just run this program: It will ask you for authorization to view metadata,
+//! and then display you the contents of your Google Drive root directory.
+//!
+//! This example demonstrates how to use the [interactive OAuth 2 flow for installed
+//! applications.](https://developers.google.com/identity/protocols/OAuth2InstalledApp)
+//!
+//! Copyright (c) 2016 Google, Inc. (Lewin Bormann <lbo@spheniscida.de>)
+
+extern crate hyper;
+extern crate yup_oauth2;
+extern crate serde_json;
+extern crate google_drive3;
+
+use std::path::Path;
+
+use yup_oauth2::{Authenticator, FlowType, ApplicationSecret, DiskTokenStorage,
+                 DefaultAuthenticatorDelegate, read_application_secret};
+use google_drive3::Drive;
+
+const CLIENT_SECRET_FILE: &'static str = "example_client_secret.json";
+
+// reads the provided example client secret, the quick and dirty way.
+fn read_client_secret(file: String) -> ApplicationSecret {
+    read_application_secret(Path::new(&file)).unwrap()
+}
+
+fn main() {
+    let secret = read_client_secret(CLIENT_SECRET_FILE.to_string());
+    let authenticator = Authenticator::new(&secret,
+                                           DefaultAuthenticatorDelegate,
+                                           hyper::Client::new(),
+                                           DiskTokenStorage::new(&"token_store.json".to_string())
+                                               .unwrap(),
+                                           Some(FlowType::InstalledInteractive));
+    let hub = Drive::new(hyper::Client::new(), authenticator);
+
+    let (_resp, list_result) = hub.files().list().q("'root' in parents and trashed = false").doit().unwrap();
+
+    for file in list_result.files.unwrap_or(vec![]) {
+        println!("{} ({})",
+                 file.name.unwrap_or(String::new()),
+                 file.mime_type.unwrap_or(String::new()));
+    }
+}