Support for translating PDF files

DESCRIPTION

@@ -2,7 +2,8 @@ Package: googleLanguageR
 Title: Call Google's 'Natural Language' API, 'Cloud Translation' API, 
   'Cloud Speech' API and 'Cloud Text-to-Speech' API
 Version: 0.3.0.9000
-Authors@R: c(person("Mark", "Edmondson", email = "r@sunholo.com", role = c("aut", "cre")),
+Authors@R: c(person("Aleksander", "Dietrichson",email = "dietrichson@gmail.com", role=c("ctb")),
+            person("Mark", "Edmondson", email = "r@sunholo.com", role = c("aut", "cre")),
              person("John", "Muschelli", email = "muschellij2@gmail.com", role = c("ctb")),
              person("Neal", "Richardson", email = "neal.p.richardson@gmail.com", role = "rev",
              comment = "Neal reviewed the package for ropensci, 
@@ -24,7 +25,7 @@ Depends: R (>= 3.3)
 License: MIT + file LICENSE
 Encoding: UTF-8
 LazyData: true
-RoxygenNote: 7.1.0
+RoxygenNote: 7.2.3
 VignetteBuilder: knitr
 Imports:
     assertthat,
@@ -37,6 +38,7 @@ Imports:
     tibble,
     utils
 Suggests: 
+    pdftools,
     cld2,
     testthat,
     knitr,

NAMESPACE

@@ -13,9 +13,12 @@ export(gl_talk_shiny)
 export(gl_talk_shinyUI)
 export(gl_translate)
 export(gl_translate_detect)
+export(gl_translate_document)
 export(gl_translate_languages)
 import(assertthat)
 import(base64enc)
+importFrom(base64enc,base64decode)
+importFrom(base64enc,base64encode)
 importFrom(googleAuthR,gar_api_generator)
 importFrom(googleAuthR,gar_attach_auto_auth)
 importFrom(googleAuthR,gar_auth_service)

R/translate-document.R

@@ -0,0 +1,83 @@
+#' Translate document
+#'
+#' Translate a document via the Google Translate API
+#'
+
+#'
+#' @param d_path path of the document to be translated
+#' @param output_path where to save the translated document
+#' @param format currently only pdf-files are supported
+#'
+#' @return output filename
+#' @family translations
+#' @import assertthat
+#' @importFrom base64enc base64encode
+#' @importFrom base64enc base64decode
+#' @importFrom utils URLencode
+#' @importFrom googleAuthR gar_api_generator
+#' @importFrom tibble as_tibble
+#' @importFrom stats setNames
+#' @export
+#'
+ #' @examples
+#'
+#' \dontrun{
+#' gl_translate_document(system.file(package = "googleLanguageR","test-doc.pdf"), "no")
+#'
+#' }
+gl_translate_document <- function(d_path,
+                                  target = "es-ES",
+                                  output_path = "out.pdf",
+                                  format = c("pdf"),
+                                  source = 'en-UK',
+                                  model = c("nmt", "base"),
+
+                                  location = "global"){
+
+  ## Checks
+  assert_that(is.character(d_path),
+              is.character(output_path),
+              is.string(target),
+              is.string(source))
+
+  format <- match.arg(format)
+  model  <- match.arg(model)
+
+  format <- paste0("application/",format)
+
+  if(file.exists(output_path)) stop("Output file already exists.")
+
+  payload <-
+    list(
+      target_language_code = target,
+      source_language_code = source,
+         document_input_config = list(
+           mimeType = format,
+           content = base64encode(d_path)
+         )
+    )
+
+
+  project_id <- gar_token()$auth_token$secrets$project_id
+  LOCATION <- location
+
+  my_URI <- paste0(
+    "https://translation.googleapis.com/v3beta1/projects/",
+    project_id,
+    "/locations/",
+    location,":translateDocument")
+
+
+  call_api <- gar_api_generator(my_URI, "POST" )
+
+  me <- tryCatch(call_api(the_body = payload), error=function(e){print(e)})
+
+    writeBin(
+      base64decode(
+        me$content$documentTranslation[[1]]
+      ), output_path)
+
+    path.expand(output_path)
+
+}
+

tests/testthat/test-translate-document.R

@@ -0,0 +1,17 @@
+source("prep_tests.R")
+test_that("document tranlation works", {
+  skip_on_cran()
+  skip_on_travis()
+
+  my_out <- tempfile(fileext = ".pdf")
+
+  gl_translate_document(system.file(package = "googleLanguageR","test-doc.pdf"), target = "no",output_path = my_out)
+
+  my_pdf1 <-pdftools::pdf_data(my_out)
+
+  my_pdf2 <- pdftools::pdf_data(
+    system.file(package = "googleLanguageR","test-doc-no.pdf")
+    )
+
+  expect_equal(my_pdf1[[1]]$text, my_pdf2[[1]]$text)
+})