Defines functions normalize_region get_cognitive_token

Documented in get_cognitive_token

#' Obtain authentication token for a cognitive service
#' @param key The subscription key for the service.
#' @param region The Azure region where the service is located.
#' @param token_url Optionally, the URL for the token endpoint.
#' @export
get_cognitive_token <- function(key, region="global", token_url=NULL)
        token_url <- if(region != "global")
            sprintf("https://%s.api.cognitive.microsoft.com/sts/v1.0/issueToken", normalize_region(region))
        else "https://api.cognitive.microsoft.com/sts/v1.0/issueToken"

    hdrs <- httr::add_headers(`Ocp-Apim-Subscription-Key`=unname(key))
    res <- httr::POST(token_url, encode="form", hdrs)
    rawToChar(process_cognitive_response(res, "stop"))

normalize_region <- function(region)
    tolower(gsub(" ", "", region))

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AzureCognitive documentation built on Oct. 23, 2020, 6:43 p.m.