--- /dev/null
+is_acceptable_license <- function(license) {
+ # determine if license text is acceptable
+
+ if (length(grep('^file ',license))) {
+ # skip file licenses
+ return(FALSE)
+ }
+ license <- license_text_reduce(license)
+ action = db_license_override_name(license)
+ if (!is.null(action)) {
+ return(action)
+ }
+ license <- license_text_further_reduce(license)
+ action = db_license_override_name(license)
+ if (!is.null(action)) {
+ warn('Accepting/rejecting wild license as',license,'. FIX THE PACKAGE!')
+ return(action)
+ }
+ license <- license_text_extreme_reduce(license)
+ action = db_license_override_name(license)
+ if (!is.null(action)) {
+ warn('Accepting/rejecting wild license as',license,'. FIX THE PACKAGE!')
+ return(action)
+ }
+ error('Wild license',license,'did not match classic rules; rejecting')
+ return(F)
+}
+
+license_text_reduce <- function(license) {
+ # these reduction steps are sound for all conformant R license
+ # specifications.
+
+ # compress spaces into a single space
+ license = gsub('[[:space:]]+',' ',license)
+ # make all characters lower case
+ license = tolower(license)
+ # don't care about versions of licenses
+ license = chomp(sub('\\( ?[<=>!]+ ?[0-9.-]+ ?\\)',''
+ ,sub('-[0-9.-]+','',license)))
+ # remove any extra space introduced
+ license = chomp(gsub('[[:space:]]+',' ',license))
+ return(license)
+}
+
+license_text_further_reduce <- function(license) {
+ # these reduction steps are heuristic and may lead to
+ # in correct acceptances, if care is not taken.
+
+ # uninteresting urls
+ license = gsub('http://www.gnu.org/[[:alnum:]/._-]*','',license)
+ license = gsub('http://www.x.org/[[:alnum:]/._-]*','',license)
+ license = gsub('http://www.opensource.org/[[:alnum:]/._-]*','',license)
+ # remove all punctuation
+ license = gsub('[[:punct:]]+','',license)
+ # remove any extra space introduced
+ license = chomp(gsub('[[:space:]]+',' ',license))
+ # redundant
+ license = gsub('the','',license)
+ license = gsub('see','',license)
+ license = gsub('standard','',license)
+ license = gsub('licen[sc]e','',license)
+ license = gsub('(gnu )?(gpl|general public)','gpl',license)
+ license = gsub('(mozilla )?(mpl|mozilla public)','mpl',license)
+ # remove any extra space introduced
+ license = chomp(gsub('[[:space:]]+',' ',license))
+ return(license)
+}
+
+license_text_extreme_reduce <- function(license) {
+ # remove everything that may or may not be a version specification
+ license = gsub('(ver?sion|v)? *[0-9.-]+ *(or *(higher|later|newer|greater|above))?',''
+ ,license)
+ # remove any extra space introduced
+ license = chomp(gsub('[[:space:]]+',' ',license))
+ return(license)
+}
+
+license_text_hash_reduce <- function(text) {
+ # reduction of license text, suitable for hashing.
+ return(chomp(tolower(gsub('[[:space:]]+',' ',text))))
+}
+
+get_license <- function(pkg,license) {
+ license <- chomp(gsub('[[:space:]]+',' ',license))
+ if (length(grep('^file ',license))) {
+ if (length(grep('^file LICEN[CS]E$',license))) {
+ file = gsub('file ','',license)
+ path = file.path(pkg$path, file)
+ if (file.exists(path)) {
+ license <- license_text_reduce(readChar(path,file.info(path)$size))
+ } else {
+ path = file.path(pkg$path, 'inst', file)
+ if (file.exists(path)) {
+ license <- license_text_reduce(readChar(path,file.info(path)$size))
+ } else {
+ error('said to look at a license file but license file is missing')
+ }
+ }
+ } else {
+ error('invalid license file specification',license)
+ return(NA)
+ }
+ }
+ return(license)
+}
+
+get_license_hash <- function(pkg,license) {
+ return(digest(get_license(pkg,license),algo='sha1',serialize=FALSE))
+}
+
+is_acceptable_hash_license <- function(pkg,license) {
+ license_sha1 <- get_license_hash(pkg,license)
+ if (is.null(license_sha1)) {
+ return(FALSE)
+ }
+ action = db_license_override_hash(license_sha1)
+ if (is.null(action)) {
+ action = FALSE
+ }
+ if (action) {
+ warn('Wild license',license,'accepted via hash',license_sha1)
+ }
+ return(action)
+}
+
+
+accept_license <- function(pkg) {
+ # check the license
+ if (!('License' %in% names(pkg$description[1,]))) {
+ fail('package has no License: field in description!')
+ }
+ accept=NULL
+ for (license in strsplit(chomp(pkg$description[1,'License'])
+ ,'[[:space:]]*\\|[[:space:]]*')[[1]]) {
+ if (is_acceptable_license(license)) {
+ accept=license
+ break
+ }
+ if (is_acceptable_hash_license(pkg,license)) {
+ accept=license
+ break
+ }
+ }
+ if (is.null(accept)) {
+ fail('No acceptable license:',pkg$description[1,'License'])
+ } else {
+ notice('Auto-accepted license',accept)
+ }
+ if (accept == 'Unlimited') {
+ # definition of Unlimited from ``Writing R extensions''
+ accept=paste('Unlimited (no restrictions on distribution or'
+ ,'use other than those imposed by relevant laws)')
+ }
+ return(accept)
+}