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##############################################################################################
#' @title Get and store the file names, S3 URLs, file size, and download status (default = 0) in a data frame
#' @author
#' Claire Lunch \email{clunch@battelleecology.org}
#' Christine Laney \email{claney@battelleecology.org}
#' @description Produces a data frame that is populated by available tiles for the AOP product.
#'
#' @param m.urls The monthly API URL for the AOP tile.
#' @param tileEasting A vector containing the easting UTM coordinates of the locations to download.
#' @param tileNorthing A vector containing the northing UTM coordinates of the locations to download.
#' @param token User specific API token (generated within neon.datascience user accounts). Optional.
#'
#' @return A dataframe comprised of file names, S3 URLs, file size, and download status (default = 0)
#' @references
#' License: GNU AFFERO GENERAL PUBLIC LICENSE Version 3, 19 November 2007
# Changelog and author contributions / copyrights
# Claire Lunch (2018-02-19): original creation
# Christine Laney (2018-03-05): Added functionality to get new list of URLs if the old ones expire, during the download stream.
##############################################################################################
# get and stash the file names, S3 URLs, file size, and download status (default = 0) in a data frame
getTileUrls <- function(m.urls, tileEasting, tileNorthing, token=NA_character_){
url.messages <- character()
file.urls <- c(NA, NA, NA)
for(i in 1:length(m.urls)) {
tmp <- getAPI(m.urls[i], token)
tmp.files <- jsonlite::fromJSON(httr::content(tmp, as="text", encoding="UTF-8"),
simplifyDataFrame=T, flatten=T)
# check for no files
if(length(tmp.files$data$files)==0) {
url.messages <- c(url.messages, paste("No files found for site", tmp.files$data$siteCode,
"and year", tmp.files$data$month, sep=" "))
next
}
# filter to only files for the relevant tiles
ind <- numeric()
for(j in 1:length(tileEasting)) {
ind.j <- intersect(grep(paste('_', tileEasting[j], '_', sep=''), tmp.files$data$files$name),
grep(paste('_', tileNorthing[j], '_', sep=''), tmp.files$data$files$name))
if(length(ind.j)>0) {
ind <- c(ind, ind.j)
} else {
url.messages <- c(url.messages, paste("No tiles found for easting ",
tileEasting[j], " and northing ",
tileNorthing[j], sep=""))
}
}
ind <- unique(ind)
tile.files <- tmp.files$data$files[ind,]
file.urls <- rbind(file.urls, cbind(tile.files$name,
tile.files$url,
tile.files$size))
# get size info
file.urls <- data.frame(file.urls, row.names=NULL)
colnames(file.urls) <- c("name", "URL", "size")
file.urls$URL <- as.character(file.urls$URL)
file.urls$name <- as.character(file.urls$name)
if(length(url.messages) > 0){writeLines(url.messages)}
file.urls <- file.urls[-1, ]
return(file.urls)
}
}
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