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extern crate serde; extern crate serde_json; use std::str; use std::error::Error; use std::collections::HashSet; static PART_DELIMETER: &'static str = ":"; static SUBPART_DELIMETER: &'static str = ","; #[derive(Debug, PartialEq, Serialize, Deserialize)] pub struct Permission { #[serde(default = "default_part")] domain: String, #[serde(default = "default_hash_part")] actions: HashSet<String>, #[serde(default = "default_hash_part")] targets: HashSet<String> } fn default_part() -> String { "*".to_string() } fn default_hash_part() -> HashSet<String> { ["*"].into_iter().map(|s| s.to_string()).collect() } impl<'a> Permission { pub fn new(wildcard_perm: &str) -> Permission { let (domain, actions, targets) = Permission::init_parts(wildcard_perm); let perm = Permission { domain: domain, actions: actions, targets: targets, }; perm } fn part_from_str(s: Option<&str>) -> HashSet<String> { match s { Some("") | None => { let mut set = HashSet::new(); set.insert(String::from("*")); set } Some(s) => { let mut set = HashSet::new(); for rule in s.split(SUBPART_DELIMETER).map(str::trim) { set.insert(String::from(rule)); } set } } } fn init_parts(wildcard_perm: &str) -> (String, HashSet<String>, HashSet<String>) { let mut iter = wildcard_perm.split(PART_DELIMETER).map(str::trim); let domain = match iter.next() { Some("") | Some("*") | None => String::from("*"), Some(domain) => String::from(domain), }; let actions = Permission::part_from_str(iter.next()); let targets = Permission::part_from_str(iter.next()); (domain, actions, targets) } pub fn implies_from_str(&self, wildcard_permission: &str) -> bool { let permission = Permission::new(wildcard_permission); self.implies_from_perm(&permission) } pub fn implies_from_perm(&self, permission: &Permission) -> bool { if self.domain != "*" { if self.domain != permission.domain { return false; } } if !self.actions.contains("*") { if !&self.actions.is_superset(&permission.actions) { return false; } } if !self.targets.contains("*") { if !&self.targets.is_superset(&permission.targets) { return false; } } return true; } } pub fn is_permitted_from_str<'a, I>(required_perm: &str, assigned_perms: I) -> i32 where I: IntoIterator<Item = &'a str> { let required_permission = Permission::new(&required_perm); for assigned in assigned_perms { let assigned_permission = Permission::new(assigned); if assigned_permission.implies_from_perm(&required_permission) { return 1; } } return 0; } pub fn is_permitted_from_perm(required_perm: &str, assigned_perms: Vec<Permission>) -> i32 { let required_permission = Permission::new(required_perm); for assigned in assigned_perms { if assigned.implies_from_perm(&required_permission) { return 1; } } return 0; } pub fn perms_from_buffer(serialized_perms: &[u8]) -> Result<Vec<Permission>, Box<Error>> { let result = try!(serde_json::from_slice(serialized_perms)); Ok(result) } #[cfg(test)] mod test { extern crate serde_json; use authz::{Permission, is_permitted_from_str, is_permitted_from_perm, perms_from_buffer}; use std::collections::HashSet; #[test] fn test_new_permission() { struct Perm<'a> { wildcard_perm: &'a str, domain: &'a str, actions: Vec<&'a str>, targets: Vec<&'a str>, } let tests = [Perm { wildcard_perm: "", domain: "*", actions: vec!["*"], targets: vec!["*"],}, Perm { wildcard_perm: "domain1", domain: "domain1", actions: vec!["*"], targets: vec!["*"],}, Perm { wildcard_perm: "domain1:action1", domain: "domain1", actions: vec!["action1"], targets: vec!["*"], }, Perm { wildcard_perm: ":action1, action2, action3", domain: "*", actions: vec!["action1", "action2", "action3"], targets: vec!["*"],}, Perm { wildcard_perm: "domain1:action1, action2:target1, target2", domain: "domain1", actions: vec!["action1", "action2"], targets: vec!["target1", "target2"], }]; for test in tests.iter() { let perm: Permission = Permission::new(test.wildcard_perm); let expected_actions: HashSet<String> = test.actions.iter().map(|x| x.to_string()).collect(); let expected_targets: HashSet<String> = test.targets.iter().map(|x| x.to_string()).collect(); assert_eq!(perm.domain == test.domain, true); assert_eq!(perm.actions == expected_actions, true); assert_eq!(perm.targets == expected_targets, true); } } #[test] fn test_part_from_str() { let tests = vec![(Some(""), vec!["*"]), (None, vec!["*"]), (Some("action1, action2, action3"), vec!["action1", "action2", "action3"]), (Some("incorrect format"), vec!["incorrect format"])]; for &(ref input, ref expected) in tests.iter(){ let expected_result: HashSet<String> = expected.iter().map(|x| x.to_string()).collect(); let result: HashSet<String> = Permission::part_from_str(*input); assert_eq!(result, expected_result); } } #[test] fn test_implies_from_str() { let perm = Permission::new("domain1:action1"); assert_eq!(perm.implies_from_str("domain1:action1:target1"), true); assert_eq!(perm.implies_from_str("domain1:action2"), false); } #[test] fn test_implies_from_perm() { let perm1: Permission = Permission::new("domain1:action1"); let perm2: Permission = Permission::new("domain1:action1,action2"); let perm3: Permission = Permission::new("domain1:action1,action2:target1"); let perm4: Permission = Permission::new("domain1:action3,action4:target2,target3"); let perm5: Permission = Permission::new("domain1:action1,action2,action3,action4"); let perm6: Permission = Permission::new(":action1,action2,action3,action4"); let perm7: Permission = Permission::new("domain1:action1,action3:target1, target2"); let perm7b: Permission = Permission::new("domain1:action5"); let perm8: Permission = Permission::new(""); assert_eq!(perm5.implies_from_perm(&perm1), true); assert_eq!(perm5.implies_from_perm(&perm2), true); assert_eq!(perm5.implies_from_perm(&perm3), true); assert_eq!(perm5.implies_from_perm(&perm4), true); assert_eq!(perm1.implies_from_perm(&perm5), false); assert_eq!(perm3.implies_from_perm(&perm5), false); assert_eq!(perm6.implies_from_perm(&perm7), true); assert_eq!(perm7.implies_from_perm(&perm6), false); assert_eq!(perm6.implies_from_perm(&perm7b), false); assert_eq!(perm7b.implies_from_perm(&perm6), false); assert_eq!(perm8.implies_from_perm(&perm1), true); assert_eq!(perm1.implies_from_perm(&perm8), false); assert_eq!(perm8.implies_from_perm(&perm2), true); assert_eq!(perm2.implies_from_perm(&perm8), false); assert_eq!(perm8.implies_from_perm(&perm3), true); assert_eq!(perm3.implies_from_perm(&perm8), false); assert_eq!(perm8.implies_from_perm(&perm4), true); assert_eq!(perm4.implies_from_perm(&perm8), false); assert_eq!(perm8.implies_from_perm(&perm5), true); assert_eq!(perm5.implies_from_perm(&perm8), false); assert_eq!(perm8.implies_from_perm(&perm6), true); assert_eq!(perm6.implies_from_perm(&perm8), false); assert_eq!(perm8.implies_from_perm(&perm7), true); assert_eq!(perm7.implies_from_perm(&perm8), false); } #[test] fn test_internalis_permitted_from_str(){ let required: &str = "domain2:action4:target7"; let assigned: Vec<&str> = vec!["domain1:action1", "domain2:action3,action4"]; assert_eq!(is_permitted_from_str(required, assigned.into_iter()), 1); } #[test] fn test_is_permitted_from_perm() { let required: &str = "domain2:action4:target7"; let assigned: Vec<Permission> = vec![Permission::new("domain1:action1"), Permission::new("domain2:action3,action4")]; assert_eq!(is_permitted_from_perm(required, assigned), 1); } #[test] fn test_perms_from_buffer() { let permissions: Vec<Permission> = vec![Permission::new("domain1:action1"), Permission::new("domain2:action3,action4")]; let serialized = serde_json::to_string(&permissions).unwrap(); let result: Vec<Permission> = perms_from_buffer(serialized.as_bytes()).unwrap(); assert_eq!(result, permissions); } }