b25406c592
- New generic http_redirect function, and two shortcuts for 303: post_redirect and 301: perm_redirect - Allow get_lib_file to take a default value, and change where master_template is set. - Fix bugs in auth code and properly trim ^M from post data. - Other cosmetic/minor improvements.
291 lines
6.9 KiB
Plaintext
291 lines
6.9 KiB
Plaintext
##############################################
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# Useful CGI functions
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NEW_LINE='
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'
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fn dprint { echo $* >[1=2] }
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fn dprintvars { { for(v in $*) { echo -n $v^'#'^$#$v^'=' $$v '; ' }; echo } >[1=2] }
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fn escape_html { sed 's/&/\&/g; s/</\</g; s/>/\>/g' $* }
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fn http_redirect {
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echo 'Status: '^$2^'
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Location: '^$1^'
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'
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exit
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}
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fn perm_redirect { http_redirect $1 '301 Moved Permanantly' }
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fn post_redirect { http_redirect $1 '303 See Other' }
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fn static_file {
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echo 'Content-Type: '`{select_mime $1}
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echo
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cat $1
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exit
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}
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# Note: should check if content type is application/x-www-form-urlencoded?
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fn load_post_args {
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if(~ $REQUEST_METHOD POST && ~ $#post_args 0) {
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ifs='&
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' for(pair in `{cat}) {
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ifs='=' { pair=`{echo -n $pair} }
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n='post_arg_'^`{echo $pair(1)|tr -cd 'a-zA-Z0-9_'}
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post_args=( $post_args $n )
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ifs=() { $n=`{echo -n $pair(2)|urldecode|tr -d '
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'} }
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}
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pair=()
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}
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if not
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status='No POST or post args already loaded'
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}
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# Status is () if at least one arg is found. DEPRECATED: access vars directly.
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fn get_post_args {
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load_post_args
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_status='No post arg matches'
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for(n in $*) {
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v=post_arg_$n
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if(! ~ $#$v 0) {
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$n=$$v
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_status=()
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}
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}
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status=$_status
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}
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# This seems slightly improve performance, but might depend on httpd buffering behavior.
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fn awk_buffer {
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awk '{
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buf = buf $0"\n"
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if(length(buf) > 1400) {
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printf "%s", buf
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buf = ""
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}
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}
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END { printf "%s", buf }'
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}
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fn urldecode {
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awk '
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BEGIN {
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hextab ["0"] = 0; hextab ["8"] = 8;
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hextab ["1"] = 1; hextab ["9"] = 9;
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hextab ["2"] = 2; hextab ["A"] = hextab ["a"] = 10
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hextab ["3"] = 3; hextab ["B"] = hextab ["b"] = 11;
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hextab ["4"] = 4; hextab ["C"] = hextab ["c"] = 12;
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hextab ["5"] = 5; hextab ["D"] = hextab ["d"] = 13;
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hextab ["6"] = 6; hextab ["E"] = hextab ["e"] = 14;
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hextab ["7"] = 7; hextab ["F"] = hextab ["f"] = 15;
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}
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{
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decoded = ""
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i = 1
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len = length ($0)
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while ( i <= len ) {
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c = substr ($0, i, 1)
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if ( c == "%" ) {
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if ( i+2 <= len ) {
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c1 = substr ($0, i+1, 1)
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c2 = substr ($0, i+2, 1)
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if ( hextab [c1] == "" || hextab [c2] == "" ) {
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print "WARNING: invalid hex encoding: %" c1 c2 | "cat >&2"
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} else {
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code = 0 + hextab [c1] * 16 + hextab [c2] + 0
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c = sprintf ("%c", code)
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i = i + 2
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}
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} else {
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print "WARNING: invalid % encoding: " substr ($0, i, len - i)
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}
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} else if ( c == "+" ) {
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c = " "
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}
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decoded = decoded c
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++i
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}
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printf "%s", decoded
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}
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'
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}
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fn crop_text {
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ellipsis='...'
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if(~ $#* 2)
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ellipsis=$2
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awk -v max'='^$"1^' ' -v 'ellipsis='$ellipsis '
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{
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nc += 1 + length;
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if(nc > max) {
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print substr($0, 1, nc - max) ellipsis
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exit
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}
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print
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}'
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}
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# Cookies
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fn set_cookie {
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# TODO: should check input values more carefully
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name=$1
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val=$2
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extraHttpHeaders=( $extraHttpHeaders 'Set-cookie: '^$"name^'='^$"val^'; path=/;' )
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}
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fn get_cookie {
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ifs=';' { co = `{ echo $HTTP_COOKIE } }
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# XXX: we might be adding a trailing new line?
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# The ' ?' is needed to deal with '; ' inter-cookie delimiter
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{ for(c in $co) echo $c } | sed -n 's/^ ?'$1'=//p'
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}
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fn select_mime {
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m='text/plain'
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if(~ $1 *.css)
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m='text/css'
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if not if(~ $1 *.ico)
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m='image/x-icon'
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if not if(~ $1 *.png)
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m='image/png'
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if not if(~ $1 *.jpg *.jpeg)
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m='image/jpeg'
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if not if(~ $1 *.gif)
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m='image/gif'
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if not if(~ $1 *.pdf)
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m='application/pdf'
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echo $m
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}
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##############################################
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# Generic rc programming helpers
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fn ll_add {
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_l=$1^_^$#$1
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$_l=$*(2-)
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$1=( $$1 $_l )
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}
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##############################################
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# Werc-specific functions
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fn get_lib_file {
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if(! ~ $#sitedir 0 && test -f $sitedir/_werc/lib/$1)
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echo -n $sitedir/_werc/lib/$1
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if not if(! ~ $#masterSite 0 && test -f $sitesdir/$masterSite/_werc/lib/$1)
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echo -n $sitesdir/$masterSite/_werc/lib/$1
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if not if(test -f lib/$1)
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echo -n lib/$1
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if not if(~ $#* 2)
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echo -n $2
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if not
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status='Can''t find lib file: '$1
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}
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fn template { awk -f bin/template.awk $* | rc $rcargs }
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# Auth code
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# Cookie format: WERC_USER: name:timestamp:hash(name.timestamp.password)
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# login_user can't be used from a template because it sets a cookie
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fn login_user {
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# Note: we set the cookie even if it is already there.
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if(get_user $*)
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set_cookie werc_user $"logged_user^':0:'^$"logged_password
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}
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# Check loggin status, if called with group arg we check membership too
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fn check_user {
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get_user
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_status=$status
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if(! ~ $#_status 0 )
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_status=(Not logged in: $"_status)
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if not if(! ~ $#* 0 && ! grep -s '^'^$logged_user^'$' etc/groups/$*) {
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dprint NOT IN GROUP
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_status=(User $logged_user not in groups $*)
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}
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status=$_status
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}
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# If not logged in, try to get user login info from POST or from cookie
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fn get_user {
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if(~ $#logged_user 0) {
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if(~ $#* 2) {
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user_name=$1
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user_password=$2
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}
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if not if(~ $REQUEST_METHOD POST)
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get_post_args user_name user_password
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if(~ $#user_name 0) {
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ifs=':' { cu=`{get_cookie werc_user|tr -d $NEW_LINE} }
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if(! ~ $#cu 0) {
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user_name=$cu(1)
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user_password=$cu(3)
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}
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}
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auth_user $user_name $user_password
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}
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if not
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status=()
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}
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# Check if user_name and user_password represent a valid user account
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# If valid, 'log in' by setting logged_user
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fn auth_user {
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user_name=$1
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user_password=$2
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pfile='etc/users/'^$"user_name^'/password'
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if(~ $#user_name 0 || ~ $#user_password 0)
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status=('Auth: missing user name or pass: '^$"user_name^' / '^$"user_password)
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if not if(! test -f $pfile)
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status=('Auth: cant find '^$pfile)
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if not if(! ~ $user_password `{cat $pfile})
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status=('Auth: Pass '$user_password' doesnt match '^`{cat $pfile})
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if not {
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logged_user=$user_name
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logged_password=$user_password
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dprint Auth: success
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status=()
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}
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}
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fn user_controls {
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echo User: $"logged_user
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}
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# .md '(meta-)data' extract
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fn get_md_file_attr {
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sed -n '/^\* '$2': /p; /^\* '$2': /q; /^$/q' < $1
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}
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#app_blog_methods = ( _post index.rss )
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#fn app_blog__post {
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# echo
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#}
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#
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#app_blog___default {
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# if (~ $blog)
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# call_app blogpost
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#}
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#
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## --
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#app_blogpost_methods = ( comment _edit )
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#
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#fn app_blogpost_comment {
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# call_app comments
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#}
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#
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## --
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#app_comments_methods = ( _post _edit )
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#
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#fn app_comments___default {
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#
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#}
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