fix null OAuthToken field in SDA accounts causing migrations to crash and burn (#227)

src/accountmanager/legacy.rs

@@ -155,7 +155,7 @@ pub struct Session {
 	#[serde(default, rename = "WebCookie")]
 	pub web_cookie: Option<String>,
 	#[serde(default, rename = "OAuthToken")]
-	pub token: String,
+	pub token: Option<String>,
 	#[serde(rename = "SteamID")]
 	pub steam_id: u64,
 }

src/accountmanager/migrate.rs

@@ -294,6 +294,10 @@ mod tests {
 				manifest: "src/fixtures/maFiles/compat/no-webcookie/manifest.json",
 				passkey: None,
 			},
+			Test {
+				manifest: "src/fixtures/maFiles/compat/null-oauthtoken/manifest.json",
+				passkey: None,
+			},
 		];
 		for case in cases {
 			eprintln!("testing: {:?}", case);

src/fixtures/maFiles/compat/null-oauthtoken/manifest.json

@@ -0,0 +1,17 @@
+{
+	"encrypted": false,
+	"first_run": true,
+	"entries": [
+		{
+			"encryption_iv": null,
+			"encryption_salt": null,
+			"filename": "nulloauthtoken.maFile",
+			"steamid": 1234
+		}
+	],
+	"periodic_checking": false,
+	"periodic_checking_interval": 5,
+	"periodic_checking_checkall": false,
+	"auto_confirm_market_transactions": false,
+	"auto_confirm_trades": false
+}

src/fixtures/maFiles/compat/null-oauthtoken/nulloauthtoken.maFile

@@ -0,0 +1 @@
+{"shared_secret":"zvIayp3JPvtvX/QGHqsqKBk/44s=","serial_number":"kljasfhds","revocation_code":"R12345","uri":"otpauth://totp/Steam:example?secret=ASDF&issuer=Steam","server_time":1602522478,"account_name":"example","token_gid":"jkkjlhkhjgf","identity_secret":"kjsdlwowiqe=","secret_1":"sklduhfgsdlkjhf=","status":1,"device_id":"android:99d2ad0e-4bad-4247-b111-26393aae0be3","fully_enrolled":true,"Session":{"SessionID":"a;lskdjf","SteamLogin":"983498437543","SteamLoginSecure":"dlkjdsl;j%7C%32984730298","WebCookie":"asdk;lf;dsjlkfd","OAuthToken":null,"SteamID":1234}}