Nothing
# Verify the integrity of a GDELT data file
#
# Compares the MD5 hash of a downloaded file to the known hash provided
# on the server.
#
IsValidGDELT <- function(f,
local_folder) {
md5_url <- "http://data.gdeltproject.org/events/md5sums"
md5_df <- tryCatch(read.delim(md5_url, sep=" ", header=FALSE, stringsAsFactors=FALSE),
error=function(e) stop(simpleError(paste("unable to read MD5 file at", md5_url),
"IsValidGDELT")))
this_md5 <- md5_df[ md5_df[,ncol(md5_df)]==f ,1]
if(length(this_md5) != 1) {
warning("Unable to find MD5 for ", f)
return(FALSE)
}
observed_md5 <- tryCatch(md5sum(paste(StripTrailingSlashes(local_folder), "/", f, sep="")),
error=function(e) stop(simpleError("unable to calculate MD5 for downloaded file",
"IsValidGDELT")))
return( observed_md5 == this_md5 )
}
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