print out the env variables to set in the demo apps after authorizing

examples/demo-async.rs

@@ -4,7 +4,7 @@
 //! the contents of a folder recursively, and fetching a file given its path.
 
 use tokio_util::compat::FuturesAsyncReadCompatExt;
-use dropbox_sdk::default_async_client::UserAuthDefaultClient;
+use dropbox_sdk::default_async_client::{NoauthDefaultClient, UserAuthDefaultClient};
 use dropbox_sdk::async_routes::files;
 
 enum Operation {
@@ -61,7 +61,13 @@ async fn main() {
         std::process::exit(1);
     }
 
-    let auth = dropbox_sdk::oauth2::get_auth_from_env_or_prompt();
+    let mut auth = dropbox_sdk::oauth2::get_auth_from_env_or_prompt();
+    if auth.save().is_none() {
+        auth.obtain_access_token_async(NoauthDefaultClient::default()).await.unwrap();
+        eprintln!("Next time set these environment variables to reuse this authorization:");
+        eprintln!("  DBX_CLIENT_ID={}", auth.client_id());
+        eprintln!("  DBX_OAUTH={}", auth.save().unwrap());
+    }
     let client = UserAuthDefaultClient::new(auth);
 
     if let Operation::Download(path) = op {

examples/demo.rs

@@ -3,7 +3,7 @@
 //! This example illustrates a few basic Dropbox API operations: getting an OAuth2 token, listing
 //! the contents of a folder recursively, and fetching a file given its path.
 
-use dropbox_sdk::default_client::UserAuthDefaultClient;
+use dropbox_sdk::default_client::{NoauthDefaultClient, UserAuthDefaultClient};
 use dropbox_sdk::files;
 
 use std::io;
@@ -61,7 +61,13 @@ fn main() {
         std::process::exit(1);
     }
 
-    let auth = dropbox_sdk::oauth2::get_auth_from_env_or_prompt();
+    let mut auth = dropbox_sdk::oauth2::get_auth_from_env_or_prompt();
+    if auth.save().is_none() {
+        auth.obtain_access_token(NoauthDefaultClient::default()).unwrap();
+        eprintln!("Next time set these environment variables to reuse this authorization:");
+        eprintln!("  DBX_CLIENT_ID={}", auth.client_id());
+        eprintln!("  DBX_OAUTH={}", auth.save().unwrap());
+    }
     let client = UserAuthDefaultClient::new(auth);
 
     if let Operation::Download(path) = op {

src/oauth2.rs

@@ -311,6 +311,11 @@ pub struct Authorization {
 }
 
 impl Authorization {
+    /// Get the client ID for this authorization.
+    pub fn client_id(&self) -> &str {
+        &self.client_id
+    }
+
     /// Create a new instance using the authorization code provided upon redirect back to your app
     /// (or via manual user entry if not using a redirect URI) after the user logs in.
     ///
@@ -583,9 +588,9 @@ impl TokenCache {
     /// Set the current short-lived token to a specific provided value. Normally it should not be
     /// necessary to call this function; the token should be obtained automatically using the
     /// refresh token.
-    pub async fn set_access_token(&self, access_token: Arc<String>) {
-        let mut write = self.auth.write().await;
-        write.1 = access_token;
+    pub fn set_access_token(&self, access_token: String) {
+        let mut write = self.auth.write_blocking();
+        write.1 = Arc::new(access_token);
     }
 }