World Traffic Service failed to render due to Authentication issue.

PrashantGaykar

Hi There,

We are using Kotlin Maps SDK (version : 200.8.0) in our Android App to display maps.

Our QA backend release new URL to display traffic heat layer.
URL : https://traffic.arcgis.com/arcgis/rest/services/World/Traffic/MapServer

Whenever app tries to load traffic layer using this url the SDK throws following error.
An ArcGIS authentication error occurred when accessing https://www.arcgis.com. An API key or credential may be required. For more information see https://developers.arcgis.com/kotlin/security-and-authentication/.

Following is my code to render traffic layer in Kotlin.

fun getTrafficLayer(accessToken: String): BasemapResult.AsLayer {
    ArcGISEnvironment.apiKey = ApiKey.create(accessToken)
val newLayer = ArcGISMapImageLayer("https://traffic.arcgis.com/arcgis/rest/services/World/Traffic/MapServer/")
    newLayer.name = "Traffic Layer"
    return BasemapResult.AsLayer(newLayer)
}

I am getting accessToken from backend.

although other layers (vector,satellite) able to load successfully with same API Key.

I tried to load this traffic URL on web with access token and few other parameter and worked successfully.
e.g. : https://traffic.arcgis.com/arcgis/rest/services/World/Traffic/MapServer/export?bbox=2969828.768378092%2C-3115102.2103630807%2C2984695.7703795386%2C-3098763.7955671465&bboxSR=102100&imageSR=102100&size=778%2C855&dpi=96&format=png32&transparent=true&layers=show%3A4%2C51%2C7%2C12%2C54%2C15%2C20%2C57%2C23%2C28%2C60%2C31%2C48%2C63%2C43&f=image&token=ABC123

It means there is no issue with access token.
I dont know why it is failing to authenticate on Mobile only. 

Is this an API Key issue ? Does traffic service needs to be enabled for this particular API Key / Account ?

Please help me resolved this issue.

Regards,
Prashant

MikeWilburn

It turns out this is a known limitation where API keys cannot be used to access ArcGIS map image layers directly. However, we can still get this to work by creating a PregeneratedTokenCredential with your API key and adding this to the ArcGIS credential store.

Here's how that would look:

val trafficLayer = "https://traffic.arcgis.com/arcgis/rest/services/World/Traffic/MapServer/"

val tokenInfo = TokenInfo(
    accessToken = apiKey.toString(),
    expirationDate = Instant.now().plus(Duration.ofHours(2)), //an expiration equal to or less than your API key expiration
    isSslRequired = true
)
val trafficCredential = PregeneratedTokenCredential(
    url = trafficLayer,
    tokenInfo = tokenInfo
)

// Ensure that you add the credential to the store prior to loading the layer
ArcGISEnvironment.authenticationManager.ArcGISCredentialStore.add(trafficCredential)

// Continue with loading the traffic layer